This park contains a large variety of geothermal marvels. [1280x960]
Each pool has a name, but I didn't write any of them down. [1280x960]
I think this one's called Champagne Pool.
In this second picture of Champagne Pool, you can see the bubbles that give it its name.
Another bunch pools that I don't remember the names for. I do remember that you're not supposed to smoke around them, however.
A close up of one of the geothermal vents in one of the pools. [1280x960]
Notice the yellow sulfur deposits on this pool. [1280x960]