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Swimsuits are rare.
A level, half-mile path leads through a mossy Douglas fir forest from Cougar Reservoir to Terwilliger Hot Springs. Also known as Cougar Hot Springs, the half dozen natural, steamy pools at the end of this trail are clustered in a small woodsy glen. The highest pools are almost too hot, but each of the lower pools is a bit cooler, so you can pick your temperature. Do not bring valuables, and leave nothing of value in your car. Do not bring drugs, alcohol, or firearms.