We rented an RV for the Memorial Day weekend and the week following planning to do a trip to the North Rim of the Grand Canyon, Bryce and Zion, but did not get a reserved RV spot at either Bryce or Zion. Should we roll the dice and hope we get a non-res spot (we've never been so don't know how busy this will be)? Are there other alternative parks that may have openings? We weren't planning to take a car because we wanted to stay in the parks. Hubby is tempted to just cancel the whole trip!