Liz, your itinerary sounds great! We were in Barbados and St. Barts (I think) :) this past January. It was great to get away from the Pittsburgh winter from H - E - double toothpicks!
I do feel like I must warn you though. There is huge group of people going on the Mariner this fall to the Mexican Riviera. I
know that they will try to talk you into going on that cruise instead! They will tempt you with the ship, which is all balcony, the gratis wine and drinks at dinner, the inroom bar set up and the notion that tips are included :)
The price is insane, you can check it out
here. Here is the roll call post to view all the people from the board going. Everyone but me is on board!!