Round barn campsites offers a dozen or so tent sites with two big group sites. It will pretty consistently have some campers, but I've never seen all the sites full before. It is right next to the stafford brook trail to hike to the top of Bigelow and you can easily hike from your campsite to the top of the mountain and back within a day. Multiple sites including both group sites are right on the water and there is a nice beach area big enough to accomodate however many people you bring. The best tent site is on the island just offshore accessible by sandbar which is usually just knee deep. The cove makes for safe swimming away from the wind and waves offshore. Great secluded spot where you won't feel crowded like at Baxter or Grafton notch areas.