After 16 years of full-timing I had a 300-page word processing document of special places we stayed and were likely to return. We usually walked the campground and noted good sites for us. We traveled without reservations and on return trips quite often we got the best site in the place. It also included suggestions made by others on good campgrounds or boondocking spots with GPS coordinates.
We also kept in the glove compartment of our towed Jeep a form I created stating our contact information and our daughters; the planned route we'd be taking over the next month or so (remember - full-timers & traveling constantly), where we planned to stay, if known and our motorhome's description and license number. We figured if one of us was at camp and the other doing errands in town and had an accident, by looking in the glove compartment which emergency personnel would probably do, they could easily locate our RV to notify spouse. Or if both of us was in car and had an accident, they could notify daughters. We also kept daughters updated with our route & any changes in case they needed emergency personnel to find us as many times we were not in cell range. Never had to use it, luckily!