I would say that you would have the most to do on Maui. My favoured area here is the Wailea area...I don't quite know what your budget is but you might want to check out the Kea Lani...it is a fabulous property and is suite style...you would have a microwave, little frig, and sink...we save a bit by purchasing breakfast foods at the local grocery store(lunch too). There is a little gourmet deli on site(or there used to be) that turns into a pizzeria in the evening...a little more reasonable. Lovely rooms and connected by an oceanfront walkway to the Four Seasons, Renaissance Wailea(I believe) and an Aston property plus some condos....truly lovely...4-5 crescent beaches in a row. We stayed at the Hyatt on Kauai, but I understand that they know have a Sheraton close by. The water on the south shore will be wavy in August though...much more placid on the north shore...Princeville is a phenomenal hotel with a view to die for, but not sure of recent rates...if you are a Starwood member it may be cheaper. On the BI, the highlight will be the property you have chosen it...my children will remember it as their most favourite of all the islands. The sights on the BI beyond the volcano which was a drive, were not very exciting in comparison to the other islands. I found that many of the condos did not provide the same amenities as the resorts did...although friends of ours did stay at the Wailea Elua condos and like them.