As you approach, your nose will pick up the strong scent of the sulfur springs—more than 20 belching pools of muddy water, multicolor sulfur deposits, and other assorted minerals baking and steaming on the surface. Actually, you don't drive in. You drive up within a few hundred feet of the gurgling, steaming mass, then walk behind your guide—whose service is included in the admission price—around a fault in the substratum rock. It's a fascinating, educational half hour, though it can also be pretty stinky on a hot day.
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