Trego Hot Springs is located near Lovelock, NV and features hot springs. The trail is primarily used for hiking.
It's actually closer to Gerlach. Some sharp rocks at the bottom of the springs, bring shoes you can wear in. Nice in the middle of winter, but it really sucks when you have to get out.
300 yard long Hot Spring Trench in the Southern Black Rock Desert. Great place to just chill, and swim. Excellent views. Right next to the train tracks.