http://www.cleverscampcamp.com/camping-rhode-island-beaches/

Are there beaches in Massachusetts or Rhode Island you can drive on?
I have a Jeep w/ 4×4 and would love to drive out to the beach and camp out for the day, anyone know of a beach in this area that will allow this? Just lookin for a day thing, not a seasonal pass or anything.
In 1970 you could do what ever the hell you wanted on the beach. You could park your jeep on Cape Cod and say: F.U.! to the government, “I’m living on this sand dune now!”, and then hang a mail-box on the hood of your 4×4.
Seriously though, with every year there are less and less places to drive re: beaches. I would surf on over to:
http://www.nps.gov/
They have outstanding information.
Recumbent Bicycle Tour Rhode Island Beaches