The coasters don't take that long and you can do them first thing when you arrive. Try to show park at 08:30am, and be there when they play the national anthem at 9am. Kracken and JTA are in the back of the park to the left. You can usually get them done, then head to the first show.
Eat lunch at 11:30am to beat the crowd. Even if you are not hungry, you will be when you sit down and start eating.
On the Polar Bear tour, do the walk thru and not the ride. It's a simulator that makes some people sick. You'll see the exact same movie.