Originally Posted by slippahs

I'm piggybacking on what Recreation said, but the reason for going early to visit the Arizona Memorial is because everyone is given a ticket for admission that will list a time for visiting the memorial itself. If you get there early, you're more likely to get one of the first tickets, whereas getting there in the later morning or early afternoon may get you a very late ticket (e.g., get there at 11A, have a ticket for 3:30P). Tickets are first come first served.