Among the plentiful options in Oregon is one accessible by a 1.5-mile walk through Mount Hood National Forest that features lower and upper bathhouses with log tubs and 6-foot round tubs. For another rustic-yet-beautiful place, seek out the thermal waters in Princeton that feature pools, a general store, bunkhouses and campsites.
For a more resort-style experience, go to Paisley or McKenzie Bridge. Ashland has both a higher-end hot springs resort and one that offers various types of camping. La Grande features two hot springs, one a historic B&B and the other an RV park with seasonal pools and yurts.
A hot springs retreat center in Detroit offers wellness programs and spa treatments and is open for day visits and overnight stays. In Burns, enjoy a hot springs pond and private tubs accompanied by various accommodations (including teepees) or head to Cove, where the public swimming pool is warmed by hot springs.