A great place to go, plan on spending two days there. You simply can't see everything and participate in all the activites in one day. You will get two days admission with your regular ticket. The evening show is the best on the island by far. The Luau is all you can eat, no alcohol, and very good. A great intro to the Polynesian islands!
The ticket prices are a little high for what you get, but with a military discount you get a good rate. We go here a lot, it's a very beautiful drive from our home. The windward side of the island is lush and gorgeous. There are several shows throughout the day with dolphins and sea lions. You can feed honu (sea turtles) and sea lions for $2. There is a gigantic aquarium that the kids seem to love. You can swim with the dolphins here, snorkel with the stingrays, and have your picture taken underwater with the fish for an extra fee.
Ko Olina is one of the most beautiful spots in Hawaii. There are five lagoons here with limited parking at each one which makes these beaches delightfully uncrowded. However, because of this getting to the lagoons early is a must, especialy on weekends. The waves are minimal, the snorkeling is fair, and at some of the lagoons there are free chaises to use.
The Memorial over sunken USS Arizona is a must visit. Before you take a boat ride to the memorial you are given a chance to see the museum and then view a short movie about the war. When at the memorial you can see the top of the sunken battleship as well as the striking wall of names.
The USS Arizona Memorial is positioned above the sunken battleship honoring the 2000 plus service men and women who perished on December 7, 1941. There is a museum and movie that you watch before you depart on the boat that takes you to the memorial. The movie is very informational and takes you back to what it was like in 1941.