The OHV trails here are extensive. You could spend days exploring this area. If you want a fun, challenging obstacle, try the canyon east of Squeeze Rock. ATVS, UTVs and dirt bikes will especially like this network of trails.
From east side of Phoenix, take Highway 87 northeast to Bush Highway, Exit 199. Turn north at the exit to a giant gate at a large circular paved area (this is not for parking). Pass through gate and follow a wide gravel road northeast 1.4 miles. At bottom of hill, follow Forest Road 403 east through camping and parking areas.