I am most fond of my experiences in HI in which I blend in with the local population. I'm a haole (Caucasian) but it's still possible. Here are some of my "hacks" to hopefully help you have an amazing experience on Oahu and or the other islands.
1. Chill out - you're not on the mainland, you're in the islands, the pace is slow. Don't honk at other drivers because they are moving fast enough on that green light, patience goes a long way.
2. Blend - I like to buy car stickers for my rental car - a Hawaiian islands map sticker is good, HIC (Hawaiian Island Creations) will work or buy a couple of local band stickers such as "The Green or Fiji" etc. Just peel them off prior to turning in your vehicle. This may limit break-ins etc. But note, be smart, don't leave valuables in the car.
3. Clothing - wear your loud Aloha shirts at Luau's or dinners. Again, local brand tshirts will help blend - HIC, University of HI hats, shirts. Go to the local swap meet at Aloha Stadium on Saturday, Sunday for great deals and local t-shirts.
4. Respect - be kind, say hi and smile to everyone - no ALOOOOOHAs, that gets annoying. Treat the local workers in the hotels, restaurants, etc. with respect.
5. Donate - when visiting, donate to the local attractions such as Hanauma Bay, etc. it costs money to protect an preserve, you'll feel better about it.