In MA (on the NH boarder) there's
Salisbury Beach State ReservationIn RI there's
Fishermen's Memorial State Park and CampgroundBoth are as close to the beach as you can get for the North East.
Going to be tough to find a site booking this late in the season but who knows you might get lucky.
Mike
2022 F-150 3.5 EcoBoost 4X4 Supercrew GCWR 19,500 157WB
Payload 2476 Maxtow 13,800 3.73 Equalizer 4 Pt Sway Hitch
2017 Jayco Jay Flight 24RBS
Old TV, 07 Toyota Tacoma, Double Cab, Factory Tow Pkg, retired towing at 229K. (Son now owns truck)