This small quaint campsite is one of the better ones along the Deschutes river. Blink, and you might miss it driving by. Years ago it was a free campground, but that changed with USFS budget rules. Still, last I checked it was only $10. The campground only has room for 7 tents, or campers, and there isn't much privacy between the spots. But if you go mid-week, or off season, there's a chance you'll even have the campground to yourself.
There is very easy access to the Deschutes river, which can be heard from every campsite, plus the cool waters keep things a tad nicer in the summer. Fishing trails go along it's bank as well. You could put a boat in here, and pull out downstream around Sunriver as well.
Pringle Falls itself are actually upstream, and harder to access than you may think. It requires going back to the road, finding a place to park, or walking along private property upstream from the campground. The falls themselves are pretty small.
If this campground is full, or not to your liking, just upstream are Wyeth, and Big Bull campgrounds. Both about the same size. Big Bull however has room for larger vehicles, and a bit more space between sites. So if you have a large RV, you may want to consider that one first.