This campground is located in a northern NH state park that is known as host to the Jericho ATV festival in August.  The park offers miles of ATV trails including an offroad 4x4 trail as well as a lake for swimming, canoeing/kayaking, and fishing. There's a large sandy beach with swings and a volleyball net.There are only 20 sites, including 5 cabins and 2 lean-tos.  The cost of a cabin with bunks and mattresses is a good bargain if you prefer a little more comfort. Sites 5 & 6 are slightly removed from the other sites, will require a slight walk from your car, and you're rewarded with a beautiful view. 

Facilities include flush toilets and coin-operated showers, though they're closer to the beach than to the campground loop; there are a couple of pit toilets in the campground itself. Pets are allowed, but not in the cabins. Most of the sites are large enough to accommodate your ATV/trailer, but there is also a large parking lot. The campground was closing down for the season when I was there, but I suspect that in the summer, esp. around the time of the ATV festival, it'll be a busy place.