The sulphur springs at Soufriere are a mini-Valley of Desolation. Hiking to the sulphur deposits, you'll see a wide area devoid of vegetation due to the fumes and streams of boiling hot water. The area also has a network of trails worth exploring.
Just past the parking lot, there is a large pool where you can soak in the warm waters. Follow the trail up the hill and you'll find several covered 'private' pools alongside the 'hot' river.