coldfusion gave a few suggestions for activities, here are a few more: Arizona Memorial, snorkeling, surfing - just rent a board and try it (SUNSCREEN). I tried surfing on Waikiki years ago, rented a long board and tried it. Spent the next several days wearing long pants because my Irish skin burnt like a lobster. Kayak, kayak, kayak.
Get away from the main tourist attractions.
Plenty of things to do that don't even allow alcohol. Look for those. Enjoy. Don't drink.