Yellowstone, on foot

Land, drive the Gallatin Canyon, and end the day watching a geyser erupt at dusk from a 1904 log balcony.

Miles tonight: about 1, and that is on purpose. No hike after a travel day. The 3-mile basin loop moves to Day 4 evening.

• One stop covers groceries and dinner: Albertsons at 6999 Jackrabbit Ln, Belgrade. One minute off I-90, directly on your route south, deli with prepared meals, open to 11pm. Skip driving into Bozeman, that is 20-30 minutes the wrong way.
• Route: Jackrabbit Lane south to Four Corners, then US-191 through Gallatin Canyon (about 90 min to West Yellowstone), then 30 miles inside the park to the Inn.
• Dinner backup: a sit-down in West Yellowstone around 6:30-7:00 before the gate. The Inn dining room is unreliable after 8.
• Tonight: eruption times are posted in the lobby. Head to the 2nd-floor deck 15 minutes early. Intervals vary; trust the posted prediction, not clock math.

The most photographed view in the park from a platform above it, then a 200-foot backcountry waterfall most visitors never reach.

Miles today: 6.7 total, and here is why no single AllTrails page says 6.7: the day is four separate short walks from three parking lots, each broken out below with its own link, and the math adds up at the bottom. Bail-out: skip walk 2 and the day is 2.5 miles. Walks 1 and 2: one parking lot, no driving between them. Walks 3 and 4: two short drives, 1 mi then 4.5 mi.

• Midway lot at midday: if it is full, do not circle. Continue to Black Sand and swing back after, or let it go; you already saw Prismatic from above. Cars turn over in 15-20 min, so one pass through is fine.
• Order: Fairy Falls lot first, since it fills by mid-morning. Overlook, then the falls decision at the junction, then drive to Midway, then Black Sand on the way home.
• The best view comes first: the platform looks straight down on the full rainbow spring, so the falls decision costs nothing. Clearest on a sunny morning once the steam burns off.
• Bears, straight facts: this corridor reopened in July after the May 4 incident, closures lifted, no continued activity found. Group of four, spray out, talk on blind corners.

The one day of true granite mountains: a lake at the foot of the peaks, a waterfall, a rock perch over the water, then a canyon between 12,000-foot walls.

First, the thing that confused the card: the mountain trail starts on the far side of a lake. There are two ways across: a fun 10-minute boat ride, or a 2.4-mile walk around the shore. The boat is optional, not required. Your three versions of the day are below, with what each costs and what it does to your miles. Version A is a custom family combination, which is why no single AllTrails page shows 4.4. And to be clear: no hotel change today. You sleep at the Old Faithful Inn again tonight, so nothing gets packed this morning.

• Go straight to Jenny Lake, stops come after. The parking lot fills before 9am, so the drive down is nonstop. Everything scenic waits for the ride home.
• The ride home is the scenic half, and the links below are those stops: String Lake for a shallow warm wade, Signal Mountain summit road for the biggest no-effort view, Oxbow Bend for the mountain reflection. If the day runs long, cut Signal first, then String.
• Money: Grand Teton is a separate $35 park. The $80 America the Beautiful pass covers both parks for all 8 days. The boat is cash or card at the dock window.
• Construction, verified: one-lane road work north of Jackson Lake, up to 15 min in daytime. Enter via Jackson Lake Junction and skip the Moose area entirely (45-min delays there). The Firehole River Bridge project 1.5 mi south of the Inn adds up to 15 min only if active your week; NPS's posted dates have shifted toward September. The 6:30 start absorbs it either way.

Hot springs steaming inside a huge mountain lake by morning, then the famous geyser basin nearly to yourselves at golden hour.

Miles today: 6.5 across three walks: two by noon from one parking lot, one at golden hour from the Inn door. Each is broken out below with its own link. Bail-out: skip the evening walk and the day is 2.7. Walks 1 and 2 share one lot, zero driving between them. Walk 3 needs no car at all; it starts at the Inn door.

• Park once, walk twice: walks 1 and 2 share the West Thumb lot. Few people take the overlook loop; it is the quiet one.
• Or the lake from above instead of walk 3: Lake Butte Overlook, 31 mi east, a drive-up. Pick the evening basin or Lake Butte, not both. Same payoff twice is against the rules.
• Wildlife honesty: risk is never zero anywhere. Same drill: four together, spray, stay on the path through thermal ground.

The postcard: the full canyon with the 308-foot Lower Falls at the head of it.

First stop at Canyon, on the grandest-first rule. 0.2 mi paved to the rail, 20-30 minutes total.

• 2 miles down South Rim Drive to the lot, then a paved path with a few steps.
• Strong-legs bonus, only if the morning ran early: the Clear Lake loop (~4 mi) starts from this same area, meadows and backcountry mudpots. It costs 2.5 hours on the heaviest driving day and those meadows are active grizzly country in August. Treat it as a bonus, not the plan.

America's Serengeti at the hour the animals move: wolves, bison herds, pronghorn, sometimes a grizzly.

A string of roadside pullouts, not a hike. Sunset is about 8pm; the last 90 minutes of light are the show.

• Stop wherever the wildlife is. Binoculars out (two pairs packed), kids stay by the car, 25 yards from bison minimum.
• Quick stop en route: Tower Fall overlook, 0.1 mi to a 132-ft falls between rock spires. The base trail has been closed since 2004.
• Old West Dinner Cookout at Roosevelt runs through Sept 2, book ahead, bring cash.

A mirror lake in a sage bowl under Druid and Abiathar peaks, with resident otters.

Pairs with the Lamar run, 3 mi past the main pullouts. A 1.2-mile loop. Skip it if you chose Washburn today.

• Small unsigned pullout on the north side, easy to miss (pin below is exact). One steep quarter-mile up through sage, then a flat loop around the water.
• Calm evenings mirror the cliffs. Otters and cutthroat trout work the inlet on the far side. Open sightlines the whole way.

A sagebrush ridge walk along the rim of the Narrows, looking down into the canyon at basalt columns, with bighorn sheep on the far wall and open sightlines the whole way.

Sequence, in this order: bags in the car 7:45, drive 10 min, hike 8:15, front-desk checkout by 11, drive west. Miles this morning: 3.7. The full day reaches ~5.9 with the Terraces loop on the next card. Confirm at the Roosevelt front desk that the Yellowstone River Overlook trailhead is open; the new bridge and its new trailhead parking area opened, but final cleanup runs through November. If the desk says no, the Lost Lake Loop from the lodge door is the fallback, and it is in the box below.

• Why this came back: I cut this trail earlier because NPS listed the picnic-area trailhead closed for the Yellowstone River Bridge project. That bridge is now built and open, and the project specifically included a new overlook trailhead parking area and an expanded picnic area. Final demolition and cleanup run to Nov 30, so confirm at the desk, but this is the hike I wanted here all along.
• What you actually see: the trail climbs a sagebrush hillside, then traces the rim of the Grand Canyon of the Yellowstone at its northern Narrows. Bighorn sheep work the cliffs across the river, marmots are everywhere in the rocks, and bison and pronghorn graze the meadows behind you.
• Sightlines: open sage and grassy ridgeline the whole way, no blind forest corners. Still grizzly country, so spray out and voices up, but this is a better visibility trail than Lost Lake by a wide margin.
• Exposure: no shade and no water. Hats and full bottles, which is easy at an 8:15 start.
• Edges: it is a canyon rim, so kids stay on the inside and away from the lip, same rule as Brink on Day 5.

Travertine terraces that look like a frozen white fountain, climbed by boardwalk stairs, plus an optional field of giant tumbled boulders left by an ancient landslide.

The Terraces are the afternoon hike: 2.2 mi, and they start at the hotel. Drive 18 mi to Mammoth (30-45 min plus the one-lane bridge), check in, then walk. Wraith Falls is off the plan: Lupine Creek is a small drainage and the falls thin out by late August, which is exactly what the reviews say. Undine Falls, 2 minutes further on the same road, is fed by bigger Lava Creek and needs no walk at all, so it stays as the roadside stop.

• The Terraces are a real walk, not a viewpoint: boardwalk staircases climb the whole hillside from the Lower Terraces to the Upper, past Palette Spring, Minerva, and Canary. White and orange travertine, steam, and dead trees standing in stone. Nothing else this week looks like it.
• Elk: they lounge on the Mammoth lawns and around the terraces. Twenty-five yards minimum, and the rut starts late August, so bulls get pushy. Do not walk between a bull and his cows.
• Upper Terrace Drive is a short one-way loop by car if legs are done; it links to the same boardwalks from above.
• Why Wraith came off: the falls are on a small creek and run thin by late August. You already have Fairy Falls, the Lower Falls at the Brink, Tower Fall, and Rustic Falls on Day 7. Undine, roadside on this same drive, covers the waterfall stop with better flow and zero effort.
• The best-rated hike near Mammoth is Beaver Ponds Loop (4.7 stars, 2,300-plus reviews), and it is deliberately not here: 5.5 mi through forest and brush on the day you already hiked the canyon rim, in a corridor with repeated bear reports. It fails the open-sightline rule this trip is built on.
• Tower Fall overlook is a 5-minute spur south of Tower Junction, so hit it first, then turn west for Mammoth. Calcite Springs is optional today: the morning rim walk already gave you that canyon stretch from the other side.

The trip's guaranteed summit: 360 degrees over Swan Lake Flat, the Gallatins, and the valley running north into Montana.

Miles today: 4.5, complete as-is. No extension exists or is needed. The summit is the whole point.

• Glen Creek trailhead, on the left just past Golden Gate. Steady open switchbacks, 2.1 mi to the top. Views open early and keep growing, so even a partial climb pays.
• Weather rule, no exceptions: open slope, full exposure. Off high ground at the first thunder. This is the last hiking day and Friday is airport-only, so there is no backup: if storms threaten, start at 8 sharp.
• The afternoon is all within 5 miles: Golden Gate + Rustic Falls at the lot, Swan Lake Flat, Sheepeater Cliff basalt columns.
• Tonight ends the trip right: drive through the 1903 Roosevelt Arch, dinner or ice cream in Gardiner, and gas up there. Load the car tonight; kid mornings run 20 minutes long.
• One more thing, free and unplanned: a partial lunar eclipse peaks at roughly 10:10-10:15 pm Mountain time tonight, Aug 27 into 28, deep enough to turn the moon a rusty red. It runs roughly 8:30 to midnight. You are back at the hotel by 8 anyway, so step outside for it before bed. Mammoth has little light pollution and no driving is required.

One last drive through the Arch, then Paradise Valley to the plane.

No hiking. Target wheels 6:45; 7:15 is the latest, not the goal. No stops, no decisions: wake, load, drive, return car, airport. 85 miles, about 1 hr 45 min.

• Route: Gardiner, then US-89 north through Paradise Valley to Livingston, then I-90 west. Fast open road; watch for elk near Gardiner at dawn.
• The free last moment: the route passes straight through the Roosevelt Arch. Slow down, read it aloud, photo through the windshield.
• Car loaded and room settled last night. Gas was Thursday in Gardiner.