We stay at Winter Island Park in Salem, they have both 50 and 30 amp service, paved sites as will as grass and you are right on the water. They do not have a dump station on site but is about 1/4 mile down from them and also a honey wagon comes around. You can get on the trolly there and go into Salem and Boston. Phone number is 978-745-9430 /
www.salemweb.com/
winterisland. We have stayed there several times and never had a problem.