I added another item to my life list this weekend: Scuba dive in The Crater, outside of Salt Lake City. Here is how it's described in Backpacker magazine:
Bring your regulator and dive mask to this developed pool south of SLC for one of the only diveable soaks in North America. Managed by Homestead Resort, this surreal tub is housed in a 200 foot wide, 55 foot high natural tower formed over hundreds of years by the minerals in the hot springs itself. If you're not into underwater exploration, simply bob in the 90 degree water. $32. Not too shabby!