Update July 2020:
I finally stayed here and thoroughly enjoyed this campground. Once NH opened up to MA residents, I called and snagged a site that was available due to a cancellation. Site 26 is a narrow site with water and electric that opened up by the river, though direct access to the water was only available through the neighboring campsite, which I tried once while it was unoccupied. It was easy enough to carry my tube to the beach and float in the river, drifting above and below the river. The side closest to the beach is relatively shallow and slow; the far side under the bridge is deeper and kids were jumping off it. There was music playing at reasonable levels, picnics on the beach and on the sandbar downstream from the bridge. At night the seasonable sites light up like Christmas with strands through the trees, but it's not a blaring light. Many of the sites were unoccupied when i was there, likely because of the tropical rain that was forecast but didn't fully pan out. Bathrooms are cleaned, checked frequently throughout the day.
My ongoing quest for a high quality riverfront campground that offers tubing continues, but I have found a great option here on the Pemi River. To think, I can't believe I waited this long to investigate the campground behind the sign I've passed on the highway for decades! They only had a last minute cancellation for a full service pull through, but it was more than i wanted to spend for the weekend. Even so, I stopped by and decided after looking around that this will be on my future list. I'll know to plan well in advance!
There are a variety of sites available, including tent sites without hookups, water/electric sites, to full hookups and pull-throughs. They even offer cabins if that's your preference. The riverfront water/electric site are beautiful, though those with the lower numbers are closer to I-93, which may be a consideration if road noise bothers you. The opposite end is near the beach. The seasonal sites are neat and clean. Bathrooms are spotless. If you stay for a week, you'll get the 7th night free.
Amenities include a terrific playground in a large, grassy area, plus volleyball and horseshoes. Wi-fi is available. There's a well-equipped store, firewood for sale, and canoe/kayak/tube rentals with a free shuttle included. They'll take you up the river and leave you to float or paddle back to the campground on your own time. If you bring your own boat, there's a reasonable $5 shuttle fee.