Here are some of my favorite:

Iva Bell aka Fish Creek Hot Springs (near Mammoth, California)

Black-eyed Susans, columbine, and wild orchids seem to dance above the lush grass surrounding Fish Creek Hot Springs, also called Iva Bell. If you're a hiker who likes to skinny-dip and you wouldn't mind a 13-mile walk from Red's Meadow Campground, near Devil's Postpile, then this is the spot for you. Iva Bell features six 100- to 110-degree soaking pools located next to or near campsites. Once there, at an elevation of 7,200 feet, you'll also have a great meadow-top view of Fish Creek Valley and the mountains of the eastern Sierra. From the trailhead at the end of the road at Red's, the hike is five miles to Cold Creek, then another seven miles to the Iva Bell camp area, where the pools are located.

Blaney Hot Springs, Mariposa California Temp: 109F / 43C
37.234 N / 118.881 W
A hot springs that doubles as a mud bath? That's just one of Blaney Hot Springs' many surprises. Another is its location: the little spring is in a meadow near the John Muir Trail, right in the middle of the Sierra. Some hikers use it as a mud bath, which can be a
relaxing treat after backpacking. The site, also accessible by horseback or four-wheel-drive vehicle, is near the town of Lakeshore, some 10 miles southeast of Florence Lake. How to find it: Getting to the springs requires a 11-mile hike from the end of the road at
Florence Lake and across the south fork of the San Joaquin River. Want to spend more of your time in the springs instead of on the trail? In summer, the walk is just 5 miles on the Florence Lake Trail if you take the Sierra Queen across the lake. For details, call the Pine
Ridge Ranger District at (559) 855-5360.
www.topozone.com/map.asp

Goldmyer Hot Springs (Private)
N 47.484 W 121.391

Temp:127f / 53c
Located 25 miles outside of Bend Oregon Goldmyer is a remote, very beautiful hot springs emerging from inside an old mine shaft. The water temperature at its source is about 120 degrees. The water inside the "cave" is around 110 degrees. The water cascades into several nearby rock pools, with progressively lower temperatures. A cool water pool is located close by for cool downs. Access to the property is by fording a river, which can vary in depth from ankle depth to over waist deep or impassable. Maximum occupancy is set at 20 people per day. The entry fee is $12 per day www.goldmyer.org/
www.nwhotsprings.net/goldmyer.htm