Pretty good, basic facilities. Campsites are spread far enough apart we didn't hear much from the other campers. The nearby creek does a good job of masking sound.
Dark skies - definitely go for a night walk. The Milky Way is obvious and
we saw 3 moons of Jupiter with 8x binoculars.
There's a lot of poison oak growing in the campsites, watch yourselves.
Mosquitos were *thick* for an hour or two around dusk and up to about 10:00 AM. (end of June) Not much of a problem apart from that.
The swimming hole is across the Klamath River Highway in the river itself. You'll see a path down from the big dirt area directly across from the campground entrance. Although rivers can be dangerous, you'd have to try to get in trouble in this spot.
We had no problem with the campground water at the end of June, 2019.
Watch for ants in the outhouses after dark. There's a nocturnal species that seems drawn to toilet paper. :o
Cellphone coverage available 20 miles north starting 2 miles short of Happy Camp. You'll see the cell tower from the highway.
Groceries and a deli open in Happy Camp. There's a fine, hippy-oriented grocery store called Salmon River Outpost at Somes Bar, where the Salmon River Road hits the highway. 5/5 puts some organic oriented stores in big cities to shame.