Pedro 47, I think you're wise to invest two weeks in a trip to Hawaii. Like you, we live in the eastern US and it's a long flight to Hawaii. Depending on flight arrangements, you might consider spending a couple of days on Oahu. This would allow you to see Pearl Harbor, the Punchbowl, the North Shore, and the other sights of Oahu.
Then, perhaps take a commuter flight to Maui for five nights or so. Maui is a beautiful island and a bit more laid-back than Oahu. If you stay at the Marriott property in Kaanapali you can even fly into the West Maui airport near Kapalua (JME) and save a bit of driving time versus OGG. Drive the road to Hana, go up to Haleakala. If you're going to Hawaii late in the year, Maui is a great place to see whales.
Finish your trip with a week in Kauai. We keep going back there because, when I close my eyes and imagine Hawaii, it looks like Kauai--everything is lush and green, the mountains rise out of the seas. Though we own weeks at both Waiohai and KBC, we keep going back to KBC. We like the location as well as the resort. Being more centrally located, you can get to any part of the island from there. We enjoy the beautiful gardens as well as the pool area. The golf course is great and easily accessible. Duke's is one of our favorite Hawaii restaurants, and I love being able to walk down to the Kalapaki Burger Hut for a quick lunch.
One of the nice things about Kauai is you can do a lot, or nothing at all. It's a great place to be on the water, there are plenty of hiking opportunities. some beautiful waterfalls to see, and at the same time, is a really laid back, relaxing place. My job (like many) is fairly stressful and demands a lot of time. When we get to Kauai Beach Club, the stress begins melting away.
Honestly, in my opinion, you won't go wrong with any of the Hawaii Marriott resorts. All the islands (and properties) are special in their own way. My guess is that it won't be your last trip there.