Oahu - I love doing a circle drive. You can go clockwise if starting your day at Aulani. Head up to Haleiwa.
Dole Plantation. I think I did the maze. But mostly, I stop for Dole Whip. This used to be the only place they had it on the island. Now it’s more widely available; probably at Aulani. Parking is free. The maze has definitely been enlarged over the years; suggested time for that is 40 minutes. I wouldn’t consider it a must-do, but it’s an easy stop.
If you haven’t tried Shave Ice elsewhere, Matsumoto’s General Store is a popular place.
YouTube vloggers - that I routinely follow and with whom I have similar experiences - recommend Ululani’s for shave ice.
Following around the North Shore, you pass many beautiful beaches with crashing waves. Parking is a challenge, depending on time of year.
Waimea Falls is on the interior side of the road. It has adventure activities. Probably a fee. I have yet to go there.
My destination on the North Shore is Ted’s Bakery. I get a plate lunch / one scoop two scoop (macaroni salad and rice, can often substitute green salad). This is a Hawaiian staple. You will see restaurants called Drive-In (Rainbow, L&L…) or BBQ. The menu is fairly similar at all these. … At Ted’s, I get garlic shrimp and then haupia pie for dessert (the real reason I go). That’s a chocolate custard and a coconut jelly/pudding in a macadamia nut crust.
A lot of people head further down the road for the shrimp trucks. There you may find more offerings (and possibly long lines).
My favorite part is yet to come: the Windward side as you are on the Southbound part of this drive. When you are at Aulani, you are in the leeward, dry side. Now you get green, lush views.
The Polynesian Cultural Center showcases many of the islands and cultures that contributed to the development of Hawaii. They do offer a luau. I have been to the Center, but not the luau. (I have only been to the Old Lahaina Luau on Maui - several times). This is near the Mormon Temple and Brigham Young University - Laie.
The Ko’olau Mountain Range on your right is seen in many shows set in Hawaii. Kualoa ranch has excursions to take in these sites.
My favorite beaches are in this side; Kailua State Beach Park with its pine trees on the shore and a view of Kaneohe peninsula (home to the USMC) and Lanikai with its twin islands. Other than the convenience of the ocean at Aulani, I would suggest one of these for getting in the water.
Lanikai:
Hanauma Bay is on this side, also. It is a protected bay, but very popular. The walk down and back is fairly steep. We encountered less favorable snorkeling conditions thanks to the sand being stirred up.
That gets you about 3/4 around the circle. Probably enough for one day.