I can only imagine that car camping here books up fast. It's a beautiful river with three (I think?) big waterfalls. Plenty of mellow areas along the river to stop and swim, Lower Lewis Falls being the most popular. We hiked on up as far as we could along the river and found some really sweet and secluded camp spots set up right along the river. One of my favorites. Do not forget bugspray! I don't know what the bugs are out there but they BITE.
Campsites are really decently sized, but kind of close together. Right off the road/easy access. Bathrooms (no showers). MAKE SURE TO BOOK.