After hiking Diamond head, Connie and Jessica went to the Zoo, and Mark and I went to Pearl Harbor. There are a number of exhibits to see at Pearl Harbor. The most famous would be the Arizona Memorial. Tickets for the Arizona were free, however tours of the USS Bowfin Submarine and USS Missouri Battleship were not. There are also 2 free Museums.
We got our tickets for the Arizona, and while waiting for the scheduled time walked through the museum. The free museum is worthwhile, revealing a lot of history leading up to the attack.
The actual Arizona memorial is closed. Instead, you get on a boat, and circle the memorial, and the sunken Arizona. We were not able to get a very good view and it was a little disappointing, but at least it was free.