The main reason we stopped in Oahu was to visit Pearl Harbor and the Arizona Memorial. Here is a look at the Memorial from the shore. You can see the flag atop the Memorial at half mast.
On the memorial, the list of those who lost their lives during the attack on Pearl Harbor is shown here. Once aboard the memorial you have less than 15 minutes to look around. It is really a bit overwhelming. It is difficult to come to grips with the enormity of what you are seeing before you are being hurried off and back to shore.
This picture shows the top of the Arizona and the distant shore line.