Grand Canyon Oasis is a hidden value. Located as close as possible to Wupatki National Monument and Sunset Crater National Monument, it is right off of 89.
We were boondocking, so no hookups (hookups are available, as well as some tiny homes for rent) - but were able to use the clubhouse, which features a bathroom (no showers), a great assortment of drinks and snacks (honor system), and a nice selection of gifts for purchase. The clubhouse also has areas to hang out, laundry facilities, and other nice touches (books to read, binoculars to borrow, etc).
The entire property is well kept, and maintained, and the boondock area was a great value given the proximity to the monuments and to Flagstaff.