You can't really beat the price and location combo of Charlestown breachway. There are no hookups or even a dump station, but your site may overlook the channel and is only a very short walk away from the beach. There are toilets; only RV camping is allowed, and the units must be self contained. Stay as long as you can, then you can dump and refill your water at Burlingame State Park for free with registration and the breachway.