First Let me start by Saying Hello....
I went on my Honeymoon to Hawaii 25 years ago, currently I am the Mother of the Bride and I am a Travel Agent who specializes in Destination Weddings and Honeymoons.
Now to the Your Posting ...
No Matter what Island you choose, there are lots of things to do.
Maui's Westin Villa's offers a stay at one dine at all program. This lets you dine at Princeville Hotel and or Sheraton Maui as well as allows you to use the amenities at all three Hotels and charge it all back to the Westin. There are great Packages out there. I would be more than happy to assist you with any information regarding the islands. If you are into adventure there's Zip lining, Horseback Riding, Sunset Cruises, ATV Riding... and more. All very affordable.
Let me know if I can be of any help !