Welcome! It should be a great cruise.
As far as excursions, my wife and I have booked a few for Labadee - waterslide, rollercoaster and daybed. Haven't found anything that looks great in Nassau, and are working on something cool for Falmouth.
Here is the info about it:
Hello Cruisers
We are having a special on the Montego Bay Highlights and Beach Tour.
We are now offering a [$5 discount]
Your price price now will be $41pp (INCLUDES TRANSPORTATION AND BEACH ENTRY FEE)
We now a minimum of 10 people for this tour.
Ultimate Excursions Tours & Taxi Service
https://www.facebook.com/groups/639781924584709/permalink/721963859699848/?mibextid=Nif5oz
Check it out. Looks pretty cool.