Deep Creek Hot Springs
The Deep Creek Hot Springs, located in the foothills of the San Bernardino Mountains on the north side, can only be reached by foot. For this reason, they are in a more remote setting and this area is known to attract skinny-dippers. Deep Creek is on federal land, so campers usually stay at the Bowen Ranch, two miles on foot on the adjoining ridge. The Forest Service will check that you have a federal land Adventure Pass if in the area. There are several soaking pools there fed by natural hot water springs in the creek. A large pool has been defined by mortar installed by volunteers and there are many other small pools as well as sandy beach near the cool waters of the creek.
Sespe Hot Springs
In the Sespe Wilderness, not too far from the skate parks in Ventura, is the Sespe River, which is the last free flowing river in Southern California. The bubbling Sespe Hot Springs is reached by an 18-mile hike that begins at the Piedra Blanca Trailhead. Most people stop at 8.5 miles on this trail to camp and visit the Willet Hot Springs, but more adventurous types will keep going the extra 10 miles to reach Sespe. If you like to hike, you will be rewarded with a more remote setting in which to soak. The hottest of the Sespe waters is 190 degrees Fahrenheit and must be cooled by mixing buckets of cool runoff. This is in the Ojai Ranger District in the Los Padres National Forest.
Saline Hot Springs
The Saline Hot Springs in California’s Saline Valley is in the northwest corner of Death Valley National Park. This area is an oasis in the midst of a treacherous environment. If you seek a place that is extremely remote where you aren't likely to see anyone for miles in each direction, then this may be it. There are three sets of springs in the valley where mountains surround on all sides. The lower two have been formed with rocks and concrete, while the upper spring, three miles from the others, has been left in a more natural state.
Wilbur Hot Springs
If you are looking for a remote place to soak, but aren’t the type to hike all day in rugged terrain to get there, then the Wilbur Hot Springs Spa and Resort is a nice alternative. It is reached by a beautiful drive through the Napa Valley, and is located in a quiet valley 22 miles from Williams and 22 miles from Clearlake. The springs have been transformed into natural hot mineral water baths, which are thought to have healing properties. The water is channeled into three flumes, some of which are indoors and others out. Guests enjoy the clothing optional waters as well as other amenities on site, including massage, spa, sauna, yoga classes and the eco-friendly hotel.
Jordan Hot Springs
Located in the Kennedy Meadows in Tulare County, these hot springs are only accessed by hiking. The springs can be reached by traveling west five miles from Blackrock, then eight miles at the end of the road at the north side of Blackrock are trails to the Golden Trout Wilderness Area. From there, it is a two-mile hike into the Casa Vieja Meadows and another three-mile hike to the Jordan Hot Springs.