We went to Metzler Park last week, a Clackamas County park and campground. It was great! Mostly tents, flush toilets and hot showers (a bit of a walk to them, but there were also porta potties available closer), cool in the shade. Best of all was the creek - great for the little ones to play in and even a real swimming hole down a short path. The only downside was they were a bit disorganized about reservations, we didn't have one and there was no clear system telling which spots were reserved, we ended up next to a great spot that remained empty despite an alleged reservation.