Hieroglyphic Mountains Loop
The loop begins and ends at Boulders OHV area. You'll find the first portion of the trail to be steep and narrow, which is great for ATVs and UTVs. But you can make it in a bigger vehicle as well. After you get through this half of the trail, you'll be in wide, sandy wash bottoms. There are a lot of places to camp and no fee is required.
From I-17, Exit 223 at Carefree, head west 18.6 miles on Highway 74. Turn right on dirt road 0.4 miles after mile marker 12. Follow LP6 north about a mile to staging area.