I hope they have added in more than a water show and night time safari if they are going to stay open this late. I love AK (my 2nd fav park) but there isn't much to do that would take all day there.
We went this past October and got there at 9am opening. By noon we had done Kilimanjaro Safari, Everest twice, Dinosaur, Kali, Its Tough to be a Bug, shopped, took in some sights, and had a snack. We left the park before 12:30pm that day. It was sooooo empty. Walking from Africa to Asia we didn't see a single other person until we got close to Everest.