I took a two-day trip from Bellingham to Seattle once and tried a different route. There was a county park about halfway. I had intended to throw my sleeping bag in the bushes somewhere that no one could see me, but it rained and I hadn't brought a tent, so I went to the covered picnic area. The ranger came by really early and told me to leave. There was no fine. The biggest downside was that I was awakened long before I was ready to get up, and had to pack up and leave in a cold drizzle.