You’re looking at a long but straightforward haul: leave Colby, Kansas very early and take I-70 east for most of the day, then cut north on the Rapid City side and follow US-16 / US-16A into Keystone. Plan on about 7.5–8.5 hours of driving time before stops, and with 2 adults, 3 kids, and a Toyota Highlander, the smartest rhythm is a stop about every 2 hours for gas, bathrooms, and a quick stretch. Good real-world break points are around Hays and Russell for easy access to larger gas stations, family restrooms, and room for the kids to run around a little; if you’re leaving before sunrise, those first couple of stops will also help the day feel much less like a grind. Overnight parking is generally easiest at well-lit travel centers, and once you reach the Keystone area, expect slower mountain-town traffic, more curves, and a little parking shuffle near the attractions.
Start with Mount Rushmore National Memorial while everyone’s fresh. From Keystone, it’s a short and easy drive, and the parking is straightforward if you arrive earlier in the day. The main path from the parking area is very manageable for kids, strollers, and tired legs, and the whole visit usually takes about 2 hours if you do the walking, photo stops, and a little exploring without rushing. Summer mornings are best here: cooler temperatures, lighter crowds, and better odds of getting the classic family photo without fighting the midday rush. Admission is free, though parking costs extra, so it’s one of those stops that feels big without adding much to the budget.
Grab lunch at Carvers’ Café right on the memorial grounds so you don’t lose momentum. It’s built for convenience more than lingering, with burgers, sandwiches, salads, and kid-friendly basics, and most families spend about $15–$25 per person once drinks and sides are included. After lunch, head back into Keystone for Big Thunder Gold Mine. This is a good reset after the highway day because the mine tour gives the kids something hands-on and a little different, plus the underground setting naturally cools everyone off in the afternoon. Budget about 1.5 hours here, and keep in mind that tours can fill up in peak summer, so arriving with a little flexibility helps. After that, swing to the National Presidential Wax Museum for an easy, air-conditioned stop; it’s light, a bit quirky, and a good low-energy option for the late afternoon when everyone’s starting to fade.
Wrap the day with dinner at Ruby House Restaurant in Keystone, a solid sit-down choice after a long drive and a full sightseeing day. Expect hearty American fare, a family-friendly atmosphere, and about 1–1.5 hours for dinner; figure roughly $18–$35 per person depending on what everyone orders. By this point, it’s worth keeping the rest of the evening loose—kids will probably be ready for bed, and you’ll be glad you paced the day with those two-hour breaks and a few easy, close-together stops.