On my last trip to Enchanted Rock, we were only there for the day, but it was a beautiful day to be at the park since it had just rained the day before (as the rangers will warn you, though, the Rock is slippery when wet!!). I highly recommend camping over the weekend to fully appreciate all the trails at the park, and they have a variety of sites available. Enchanted Rock is also a good park for herp spotting when the weather is right. :)