One our personal favorites. Oahu hosts a number of top rated dive centers, a few of which are listed below. Scuba diving excursions can also be purchased from Aulani resort. Trident Adventures: https://www.tridentadventures.com/dives Dive Oahu: https://www.diveoahu.com/ Waikiki Dive Center: https://waikikidiving.com/ Aulani Diving Excursions: https://www.disneyaulani.com/activities/excursions/
Run by the National Park Service to remember a turning point in U.S. history. Danny's grandfather, a marine and veteran of World War II, was stationed at Ewa Marine Base adjacent to Pearl Harbor during and after the war.
Oahu has a number of beautiful state parks where you can hike, kayak, or relax on one of its many beaches. They are open to the public year around (I mean... it's Hawaii). A complete list and interactive map of Oahu's state parks can be found at: https://dlnr.hawaii.gov/dsp/parks/oahu/
As the website says, this is Hawaii's Complete Pineapple Experience. Group tours are currently closed, but the grounds and many of the activities are open. Admission is free, and tickets to the pineapple train and garden maze can be purchased the day of arrival.
Kayaking and jet skiing are both available through Aulani, but there are also a number of tour companies in Honolulu with whom kayaking tours can be booked. One that was recommended to us specifically for kayaking can be found at: https://www.kailuabeachadventures.com/
For your convenience, each of the above activities can be purchased and added ot your room charge through the Aulani excursion page or directly from the concierge.