Bozeman Hot Springs is the practical version of a Montana soak: developed, easy to reach, and open enough to fit around a day of hiking, skiing, or driving. The complex mixes indoor and outdoor pools at different temperatures, so it is more convenient than rustic but still gives you the pleasure of hot mineral water under a big sky.
It is especially useful in winter or after a long day in the mountains. Do not expect solitude; come for the reset, the warm water, and the fact that you can be back in Bozeman for dinner without much planning.