Advice on a first time visit to Oahu, Hawaii

Hi ~travel!

My partner and I are going to Oahu for a ten day holiday at end of October. Neither of us have been there before. We are looking for advice on what to see, eat, do. We have a rental car.
We'd love to see some less popular nooks of Oahu without angering the locals.

So far we have to do:

• Pearl harbor museum, USS Arizona.
• Surf somewhere we can both enjoy. I am experienced but in intermediate paddling shape. Partner is a novice. Trying for a couple hours' AM paddle out for a few days. Beach, point, or rock reef breaks.
• Drink a Mai Tai. Where is the best bar on the island? Posh or dive? We like dive bars but aren't afraid to splash out for a fantastic experience.
• Attend a luau. Who's got the best roast swine? Removed this on the advice of commenters, also very expensive after looking into it. Will go eat at a few food trucks instead!
• Day hikes. Where are the good trails?
• Non-surf watersports. Can't afford marlin fishing with our budget but snorkeling, diving, or sailing are realistic options.

Anything else? Some of the best travel suggestions have come from strangers in hostels or bars - probably also Tildes. Thanks for reading everyone!

edit: for brevity