Some sites are very large (even more suitable for groups), some are smaller....mainly along the road down towardcthe cul de sac if you look on their map. Cul de sac sites are very good size. Kayaking at Pillsbury St. Park-roughly 5-6 miles away, or Lake Sunapee, which is probably 10+ miles away.
I don't know about the boat landing, but yes, for the most part the campsites are good-sized, but some of the 50s (campsite #) are kinda small, especially for a camper
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