Really? No wonder I don't remember paying to get in my first time at MR NP.
Always been that way. Git your arse outta bed and git in there early.
Or sneak in the night before and sleep in yer truck in one of the pullouts. If you get caught in a pull-out, just tell 'em that you were gittin' tired trying to make it to the campground, and not wanting to hit any little park critterz, you thought the wisest choice was to pull 'er over and catch 40 winks. But OMFG! I overslept, Mr. Park Ranger! Sorry! I'll be movin' along now.
Works ever' time!