Kailua was the ancient capital of O'ahu's kings. In 1795, King Kamehameha I conquered O'ahu in his quest to unite the Hawaiian Islands after which he granted various land areas to his warriors and tribal chiefs who have helped him. Visitors can see various ancient temple ruins in Kailua, one of which is the Ulu Po Heiau State Monument.
Kailua is located 12 miles northeast of Honolulu. One of the places that you can go is the Kailua Beach. Kailua Beach is a crescent-shaped, about 2 miles in length and 50-150 feet wide. The ocean bottom fronting the beach slopes gently to overhead depths without any coral heads. This place is suitable for amateur surfers as the light to medium waves can support surfing and body surfing.
Another interesting activity that you can do in Kailua is to take the "Magical Boat Tour" which departs daily from Keauhou Bay and enjoy a unique adventure where you'll see dolphins in their natural environment. If you want more, you can also explore the historic Kona Coast, the lava tubes, and the sea caves.
For more information on Kailua, check out Hawaiian Vacation Kailua and Kauai Travel Blog. Of course, if you are looking for a place to stay, you can check out Kauai Vacation Rentals for good and cheap offers.