Quinn’s Hot Spring Resort (406/826-3150 or 888/646-9287, www.quinnshotsprings.com , $120–245), in a woodsy area three miles south of Highway 200 on Highway 135, has a clutch of newer cabins, a lodge, and a good restaurant. The temperature of the outdoor swimming pool is adjusted according to the weather; adults pay $8 (included in lodging fee) for a dip, $6 for children (must be potty trained).
Highway 135 follows the Clark Fork River from I-90 at St. Regis to Highway 200 just east of Paradise.
Cascade Campground (www.fs.fed.us/r1/lolo , late May–late Sept., $10) is a small, basic roadside Forest Service campground. It’s on Highway 135 six miles south of Highway 200. There’s a surprising amount of roadside noise generated by Highway 135, but the setting is nice; there is a hike up to a waterfall, the Clark Fork River is just across the road, and if it’s chilly, the hot springs resort is less than four miles up the highway.