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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