Chico Hot Springs Resort

Paradise Valley's grand old soak sits 30 miles north of Yellowstone's north entrance, with two open-air pools of geothermal water: the big one averages 96 degrees, the small one 103, with no chemicals or sulfur added. Day guests are welcome 8am to 11pm every day, which makes this an easy evening stop on the way back from the park. Adults pay $14 and seniors 65+ just $8; towels rent for $2.50. If you'd rather not drive afterwards, stay the night. Lodging runs from the historic main lodge to cabins, chalets and, yes, Conestoga wagons.