I'll be with some friends in Orlando in October for a conference. We arrive at 7am Wednesday and have that day free, so we would like to hit one of the theme parks. I'm mostly interested in roller coasters, as I've never been on what I would consider a "real" coaster, so that would be my number one consideration. Can I get some recommendations? From what I've seen, Busch Gardens seems to have the biggest selection, but it's a little ways away. Would Universal Studios be good enough?