Promised land state park in pa is nice. 2 beaches, good bathrooms, and the loop I usally stay at has a family confort station( pickerel point) so its private and good to get the kidos showered etc. but There are not a lot of full hook up sites there so look at that depending on what you want. Boat rentals are close. In nj, anything in the cape may area, most have lakes and pools. Plus your a short drive to the ocean. Look in the upstate NY area also. Lake george is a but further away, but good for the familly, as is niagra falls area.