Pro tip: if you want to stay at 25 mile creek state park on lake chelan and it is full, drive another 3 miles up road to snowberry. Its quiet nestled at the base of the slide ridge road and more times than not the only other visitors will be the forest service trails, or fire crews out on patrol. Mosquitos can be annoying in the late summer but the shade of the ridges and access to all of the up lake hiking makes it worth it. Also it is only three miles back down to the 25 mile creek marina, so lake access is there. This is all dry camping, tents would be best, but there are a few sites you could get a trailer into.