If your trip to Waikiki is all locked in but your itinerary is looking a little empty, let us give you a few hints and tips.If you were to ask a local for sightseeing recommendations, they'd probably point you to Honolulu Zoo and Ala Moana Center. These top attractions are bound to leave an impression.Few things beat discovering somewhere new. While you're here, Royal Hawaiian Center and International Market Place should definitely be among them. Another great attraction here is Ala Moana Beach Park.