RSA 216-I:5: Registration.

All persons upon entering a recreational campground or camping park shall register with the appropriate authorities. All recreational campground or camping park owners or operators or their agents shall upon the registration of each camper or camper's guest cause an entry to be made on a registration book or card system which shall record the campers' or camper's guests' agreed-upon departure time and date. No camper or camper's guest shall, without the consent of the campground or camping park owner or operator or his agent, remain on a campsite beyond the departure time and date so recorded at registration.