Bass Lake is located in Point Reyes. It is a great place to take a dip on a hot day if you can snag a car for the ride up. Hike in the from the Palomarin Trailhead.
If you hike passed the first easy path into the lake, you will find a rope swing for a much more exciting trip into the water.
Floats are nice and sometimes folks leave them there for others' enjoyment. You should do the same!