First, the Shoebird lounge on Waikiki, it's at the Sheraton right on the beach, order up and enjoy the scenery passing by on the beach. Do the Pearl Harbor tour, it's worth it just for the history. The Dole pineapple plantation is on the north shore, check it out and eat some pineapple. Also on the north shore is Waiamai(sp?) Bay State park, nice place to go, surfing is right across the highway. Renting a car to make the circle is a good idea, make sure it's a convertable. Polynesian cultural center is also on the north shore, another good place to visit for insight into the culture. You HAVE to purchase at least one Hawaiian shirt, go to Hilo Hattie's on Nimitz Hwy. Kinda pricey but the best quality. If you need to buy Hawaiian gifts for everyone go to the flea market at Aloha stadium on Sat., you'll find your best deals there. They also operate during the week but can't remember which day, ask the hotel folks they'll know. Anything Hawaiian is for sale there.Avoid buying gifts down near Waikiki, too pricey and you can find it at the flea market. Diamond Head and the Punchbowl have been already mentioned andI recomend them as well. Avoid the booze cruise, unless you just want to get **** faced and meet unattractive tourist ladies, they'll start looking better by the end of the cruise though. Have Fun!