Thanks Dena! Ditto--we loved Guatemala and Belize, for instance.
At the moment we're signed up for every excursion we can fit in up in the Marquesas, since I figure this will be a one-time thing. Our friend Jim is even signed up for the helicopter ride, but that's too rich for my blood (and I'd probably just throw up anyways!)
My one doubt is Rangi, since everybody seems to think that the "aquarium" snorkeling is so-so, and the coral around the top end of the island is mostly dead. We've opted for the Black Pearl trip, since we did this on Manihi and really enjoyed it, and thought Jim might like it. Otherwise I'm just going to knock around shore I expect (we're there overnight, 2 half days.)