USA, Hawaii

It´s a must to visit the Pearl Harbour memorial which is actually the sunken ship of the USS Arizona.
You need to get there very early, it opens at 7am. The later you are, the longer you queue. We arrives at 8:30 and queues for about 1.5 hours. You queue to get a ticket for a timed entry to the actual memorial which is by boat to the memorial over the USS Arizona. There´s a museum and other info to keep you busy while you wait.
To get there we took a bus from Waikiki which had Arizona on the front, it took about an hour.

We then took another bus around the island. It took forever but went through the center of the island to Hanauma Bay and then continued to the Polynesian Cultural Center. The bus took 2.5 hours to get here!
The Polynesian Cultural Center is very good. It shows the customs, dress and culture of the different islands that make up Polynesia. You do need to get here earlier than we did though to have more time.
We took a ticket that was $36 which included entrance to all the villages but not the luau evening show. They offered a backpackers discount with our HI card.

Take a day to wander around Waikiki. The beach is fairly good and you can get surfing lessons or hire a board if you want. We had a cocktail drink at the Sheraton Hotel which had a free Hula show at sunset.

Busses work like many others in the US, $2 for a ride and you can get a free transfer for use within 2 hours to get another bus.