I honestly don't know exactly what this place is officially called, but it's about two miles before the entrance to the Red Rock Conservatory.
It's on the right hand side and you take Calico Basin for about a mile and park in the lot at the end. There's picnic tables and restroom facilities there, too.
The place itself is amazing! If you are too cheap to pay $5 to go to the Conservatory, you can go here and marvel at the mountains and foliage. There's a wood ramp trail that loops around the base of the mountain and the park itself. It's a great place to relax and just sit and stare at the beauty of nature. The people walking around the area are really friendly. Most Naturists seem to be.
Check this place out. Walk around, read the signs and learn something about the desert. It's only about 20 miles North of The Strip and really easy to get to.