Beach camping at it's finest
If you're looking for beautiful beach camping that isn't super crowded, then Bear Island is the place to be! The sites are reasonably priced and include one ferry round trip per day as part of your camping fee. The sites are well spaced and you won't feel on top of one another. It is also possible to canoe/kayak out to Bear Island from the main land if you have the time, experience and the conditions are right. Be advised, there are no campfires allowed on the island (not even below the high tide line) so plan appropriately.
The beach her is beautiful and teeming with life so be sure to spend some time walking up and down the beach as the tide is going out. There are a fair number of snakes out and about so if you've got a pooch with you, exercise caution.
There are showers and potable water on the island, however, shade is hard to come by so you might want to bring a shade tent/tarp for some reprieve.