Alright, I guess the shuttle will work if you don't care about being there right as the park opens. Just means you may wait about 45 minutes if you want to ride Journey to Atlantis. Kracken will have about a 30 minute wait depending when you go. For each show, arrive 20 minutes early and you can get a seat.
Get to the shuttle load area 20 minutes before it's supposed to depart, and wait at the exact spot. When the bus is pulling up, stand up, and get right at the curb where it will pull up. I've heard a horror story of some people who were sitting on a bench waiting, the bus pulled up, everyone rushed it, and the people on the bench didn't get on. Ask where the line is, and make sure someone stays in it the entire time.