Very beautiful and scenic. About 78 degrees in June...so very nice change from PHX metro area. Bathrooms and picnic tables are available. Lots of hiking trails also
Off road vehicle is not required as roads are somewhat maintained, but I'd definitely not attempt drive in normal car if it's raining or snowing, as entire trip is dirt roads. Also beware if you have a low profile vehicle.
No services...so pack according and make sure you have gas