We actually spent 2 half days in Pearl Harbor. One was at the Arizona memorial and the Bowfish and the museum, then the next time was at the Missouri. Tours are a must to learn all you can about the start of World War II. We were fortunate to see the USS Stennis in port while we were there and a world war II vet took the tour of the Missouri with us. Reservations for the Arizona will save you a lot of time.