In my experience it is best to choose between real camping or a real resort as resort/camping places tend to be RV parks with little cabins and a swimming pool. For campsites near boston try Pearl Hill state park, or for camping a bit farther away, but on an island, look into Harbor Island State Park. Resorts can be very different and your best bet is to check out boston.citysearch.com as they have a host of resort destinations with good descriptions that are near boston.