Activity Links nearby:
Waikiki Beach Less than 200 yards to the famous Duke Statue on Waikiki's premiere surf-beach
Surfing, Windsurfing, Snorkeling & Diving, Boating, Sailing, Parasailing Many rental opportunities within 500 feet.
Hiking So many options, too many to mention. Beach, ridge and valley hikes (often end at a stunning waterfall)
Biking: Bikes can be rented at many nearby locations.
Golf: Many golf courses on the Island. The nearest is just about half a mile away.
Tennis: Many courts within walking distance. The nicest court (in Kapiolani Park, surrounded by Palm trees and Hibiscus hedges), at Queen's Surf beach is about 5 minutes walking distance.
Basketball and Beach volleyball is played almost daily.
Fitness Center: 24 Hours Fitness is on the corner of the next block, with stunning views of the beach and palm trees while you work-out.
Honolulu Zoo and Waikiki Aquarium
Diamond Head Crater a lovely short hike. On the first morning you will be up early anyway. Sunrise at Diamond Head Crater is a wonderful and romantic way to start the day.
These links are a quick start for your own research and are not meant to be a recommendation.