We spent a day at Pearl Harbor touring the USS Arizona Memorial, the USS Bowfin (a World War II submarine), the USS Missouri (the battleship where the World War II surrender documents were signed) and the Pacific Aviation Museum. It was a day full of history.
Visiting the USS Arizona memorial is a touching, solemn experience.
It took most of the day to tour all these things. I highly recommend it to anyone visiting Oahu. If you don't want to spend the whole day, you should at least visit the Arizona Memorial. They show you a movie before you get on the boat to go out to the memorial. In this movie, they interview WWII veterans, and it was so touching to hear their recollections of what happened on December 7, 1941. One of them tearfully noted that children today are not being taught much about the Pearl Harbor attack. Sadly, I have found this to be true. But it is something we all need to remember and our children should be taught, as well.