For hot springs check this out.
Just plug coordinates into google maps and it will tell you where they are.
Also if you have the time take the 2 1/2 hour drive up to bear lake and camp over night. I can tell you a free spot to camp and near an awesome not crowded part of the lake.
For a bit more of a secluded hike go all the way up alta and take the summer road a bit up and hike from there to Fantasy ridge. There usually isn't a lot of people up there and greaat views. Other than that go to the Uintas and hike Bald mountain. Not many people up there either and it's got an awesome 360 view of everything.