Boiling Springs Lake is the largest geothermal feature in the whole park and one of the biggest hot lakes in the world.
The hike to Boiling Springs Lake starts at the Warner Valley Trailhead and is only a 3 mile roundtrip hike. It's a fairly easy hike that starts through the valley and then winds up through the forest and eventually opens up to the lake.
First thing you'll notice as you approach the lake is the sulfur smell followed by the turquoise, green/brown water. The lake itself is more of a pond but the difference is its about 125 degrees fahrenheit and there is steam rising from the surface.
There are signs posted cautioning the hikers to not stray from the trail as the ground surrounding the lake is very soft from the constant heat and will give way if too much weight is on it.
Though it is a beautiful spot to explore, I wouldn't recommend hanging around the water too long as the sulfur can be quite overwhelming.
If you're looking for a base camp, I'd recommend Warner Valley Campground right near the trailhead.
Boiling Springs Lake Coordinates: 40.4356276,-121.3972202