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Thanks!
If you ever get a chance I highly highly suggest it.. It is probably the most amazing place I've ever been, and I live in Sedona.. Which is the second most amazing place. :0
If you go however, I suggest avoiding the monsoon season, cause it can flood and people have died being stuck down in there when it floods..
Also I wouldn't suggest going alone either.
Other than those couple things, it's pretty amazing. :)