Even though you'll visit Kualoa Ranch for our wedding, we HIGHLY recommend taking one of their tours on another day of your trip. The property itself is breathtaking and full of things to do. We've personally taken their movie tour to see where our favorite movies have been filmed, but you can also zipline, ATV, or ride horseback through the property.
The Polynesian Cultural Center is one of the best things you can do on the island. Imagine a Disneyland-esque park atmosphere without the lines and hassle. Both adult only or family friendly. You can spend the entire day here eating authentic food, getting the best Luau on the island, and seeing a variety of fun shows through the entire park. We highly recommend getting the Alii Luau package and just making an event of it. You can even get transportation from your hotel if needed.