This site alone was the reason Hawaii is on our bucket list. even with an amazing 12 days in Oahu and Maui this was the most striking, bold, and somber place we saw. It was a sunny day and yet you could still feel the heavy in the air :( It's a must do.
Practicalities: book online ahead of time. it guarantees you a time and a slot and only costs like $1 per person. If staying in waikiki, just take the Bus (public). I think it's bus #42 (says uss arizone on the bus listing). It's $2.50 each, takes about an hour in total and is very relaxing, drops you right off in front of the visitor center. you line up for your tour, watch a moving 20 minute video, then take the boat out to the memorial itself. check out the oil sitting on top of the water (leaking still from teh sunken Arizona).
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