Replying to Summer Public Park Riding?

Hey Oregoners,
Im from Marquette, Michigan and am looking into a big ass road trip sometime in July. I really want to ride, and am wondering what you guys have going on there in july? I saw that a few camps run in the Mount Hood area. I cant afford and dont think a camp would help me out much. Is there anywhere that has a public park we can ride? How much would public park lift tickets cost there? Is the public park any good? Are you able to poach any camp parks easily? Are there good, cheap campsites close to the area? Thanks a lot for all your info and knowledge.

- Reed