Horseneck Beach campground sites aren't particularly large, and are setup more for car camping and RVs than for tenting, but the site has great showers and a modern shower facility, and being able to walk out to the beach through the barrier dune to watch the sunset and sunrise is absolutely fantastic. I've camped here twice, once with a small group of 4 on one site, plenty big enough for all of us to have a tent, and once with a group of 15. Easy access to running water from most sites and pretty good, free, showers given the campground layout. Only downside is that the online reservation system requires a 2 night minimum, but calling the campground attendant can sometimes result in a one night reservation, especially early in the season when they're holding sites for last minute arrivals.
Hard to beat being less than an hour from Providence, RI and camping adjacent to a beach.
Our group of 13 bicycle tourists had trouble finding places to pitch tents at this campground because the ground was hard, uneven and strewn with roots and rocks. The campground has no running water, and there is a warning that the water needs to boiled or filtered at the one water pump for the whole camp. No bear/animal boxes are available for storing food or trash securely, aside from using the toilet rooms.
Camping directly on the Matanuska River provides a great view of King Mountain on the opposite bank, and there is a nearby ice cream shop/post office across the street, and a cafe a few miles west on the road for those that want showers or an indoor meal (closes at 6pm though).
Three of us used the group camp spot near the lake, as our friends dodged the rain and stayed in a nearby bunkhouse. The campground sits directly on the tundra, so care is required to stay on the paths to not cause permanent damage to the biome. The downside of camping on the tundra was no trees to hang from, and nowhere to hang our rain tarp to create a dry zone for cooking and eating, but with the heavy tables and some tent poles, we managed to create a great space for hanging out for two days. The campground has a 1 mile hiking trail that goes along the ridge above the western edge, and at the time of our stay, the blueberries were perfectly ripe along the entire trail. Also cool was that a bald eagle was using one of the trees in the finger of land going into the lake as a hunting launchpad, allowing us many great photos of it sitting and flying throughout our stay.
The campground is primitive, no showers, but has several hand pumps for getting fresh water throughout the campsite and boat launches to get out onto the lake.
I and my group of visited Paxson Lake Campground and found it to be beautifully wooded with white and black spruce (perfect for hanging a hammock!). We picked sites adjacent to only water pump within the park to save on hauling and many walked down to the lake for a cold dip, since the campground has no modern amenities. The gravel road to get into the campground was a bit of challenge on loaded touring bicycles, but wouldn't present a challenge to those in motor vehicles, as the Richardson highway is several hundred feet above the lake.
Bring mosquito coils to create a safe zone, and definitely get to know the campground host, who has been a BLM volunteer in Alaska for several years at various campgrounds.