My experience two years ago was getting there early means getting free parking even on game days. What constitutes early is probably a good question though.Ten a.m. probably is pushing your luck. I think I was usually there before 9. As ChiTown said, if "all" you want is to watch drills and minor league games on the back fields, there's no admission charge as far as I know. Those games are interesting, with loosey-goosey rules - Morneau batted every inning, third I think, in one game I watched. Sometimes a pitcher hits his pitch count and there's two outs and they just end the inning rather than warm up someone to come in. A few other sandlot-style rules have escaped my memory at the moment - I don't think I ever saw them call for a ghost-runner. Probably plenty of courtesy runners though. Good times.