I hate to talk this place up and get more people going, but here I am. The campground is beautiful. You can hear the river in the distance from any campsite, and on clear nights you can damn near see the Milky Way. Plenty of walking trails and even some nice but cold places to swim if you can find them - be careful, some fast moving and deep areas! There are 14 campsites in a big are, all pretty far from each other with decent privacy. The campgrounds also have a single male/female vault bathroom and a water faucet outside. The stench of the "bathrooms" is miserable, but it beats squatting and burying in front of others.
A park ranger/camp manager is always on site in season, and usually has firewood to sell; although I'm sure you can find plenty of fallen debris from the winter season - bring wood feom NH to burn. $20 for a stay with one car per day, I think $10 for an additional car. There's plenty of room at each site for two or three tents if you squeezed them in, and a picnic table and fire pit with a grill ready for use - 8 people to a site. If you go in May or early June there will be a ton of mosquitos, so be prepared. Also be prepared for rain and no cell service (on site, you can get some down the road a few miles), its the White Mountains after all.
Please keep food in cars, in air tight containers - the site is notorious for some bear spotting, but I've never encountered them - only the occasion large piles of destinct bear droppings. You can be fined a lot of money for not storing food and waste properly, leave no trace.
All in all, if you want an off the grid and well prepped trip, with lots of nature to see, this is a great place. The drive there is so beautiful, with a lovely lake at another campground you can stop at on the way. Bring enough food and clean water to last your trip.