Klamath Falls, Oregon

Collier Memorial State Park - no question. Our visit was in 2009 and it was without a doubt in the top 5% of the nicest state parks we've seen anywhere. Bathroom/shower facilities impeccably clean. Grounds well-groomed and totally free of litter. Gorgeous forest setting and a crystal-clear river flows through the park. Hiking trails. Full hook-up sites. In '09 it was $21 per night. The Logging Museum that is adjacent (and still under development I imagine) has an incredible collection of equipment spanning the history of the Western logging industry.