Waikiki !! Just get a nice hotel room there... If you can afford the old original Jewel of The Pacific, stay at the Sherraton Moana.
www.marriott.com/hotels/travel/hnlwi-moana-surfrider-a-westin-resort-and-spa-waikiki-beach/Alternatively, stay somewhere cheaper, and walk through its Grand Foyers a few times on your trip. Walking through is free!!
Don't get the cheap bus to your hotel. Just get a taxi. Taxi is pretty cheap, drops you at the door, heaps quicker. If on the bus, you might be 3rd last to get dropped off, and just circle around 10 hotels before yours... and with the one way streets, you will probably have passed close by to your hotel about 2 times before that anyway!
Going back home, just book a Limo to the airport. If it's AM, they are about the same price as a taxi.
Eating, Duke's on the beach is a must. Tables down the front are right on the beach. Great atmosphere.
Steinlager is cheap! Enjoy.
If you like Quiksilver gear, there's a few shops... Hawaii influence... They have a good range of "Men's" clothes also, rather than teenager clothes. Quiksilver "Silver Edition"...
Going to another island is also fun. Kaua'i is really nice. Also consider Maui.