A few things:
-- Aventura.  Cool name.  Love it.
--This hotel would have some bad views, no?  Parking garage for CBBR on one side, and parking garage/convention center on the other side.
--Regarding theme:  IF they are going to make this high-end/adults only, I hope they would take a pared down approach to theming.   If you're going to spend big bucks, I'd rather stay in a Four Seasons-type of hotel with classic approach to luxury and a focus on service VS. all-out theme park themeing (e.g. indonedian! egyptian!).  Just my opinion on that.