We returned from our 3rd Hawaii trip in May. We had 3 weeks there this time. ! week at Pahio Bali Hai in Princeville, Kauai. One week at Kona Coast II resort on a
DVC exchange in Kona, Hawaii. The remaining time was split before the first week and after the second week at two different hotels on Waikiki.
If it is your first trip, you will want to do at least 3-4 days on Oahu to do the historic things, Polynesian Cultural Center etc., but it is far from what I call Hawaii!!! Too much big city!!!
I think the Big Island of Hawaii is my personal favorite because of all the diversity there. You know, volcanos, mountains, flowers......! Kauai is a nice slow pace and very beautiful, but can get boring after awhile. We prefer the North side of Kauai (Princeville) or the East side near Kapaa . Maui has a lot to do and see, but has gotten quite commercial. I like the Lahaina area on Maui. The Road to Hana is a must there too, as well as Haleakala.
We did helicopter tours, small airplane tours, wagon team rides, and a host of driving in a rental car to the Volcanos National Park, etc. We love the old polynesian history and temples on the Big Island.
Just ask if you have more questions.