I went here about a year or so ago. I have to say that it was a great experience. I know there is not much in utah to do but this was totally worth the trip. We drove up from Vegas for a day and it was so much fun. The trails you can walk and the thinkgs you see are amazing. Becareful for the wildlife I hear some can be dangerous although i didn't experience anything like that. i would refrain from bringing kids with you on this trip because the walking is alot and the trails are very bumpy so and strollers are not doable on the trails. I really suggest driving through them as well. They are a sight to see.
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