hey georgiasmom,
if you go to
disney cruise line port adventure page (
http://disneycruise.disney.go.com/cruises-destinations/shore-excursions/ ) you can select nassau or
castaway cay and see what excursions are offered. If you have questions on a particular excursion, don't hesitate to ask. I'm not an expert but we've been to nassau 7 times and to castaway cay 4 times. I'm also sure there are others on the disboards that can answer them too.
Now here is the itinerary and a few events on the ship:
Day 1 - sun, jan 20 port canaveral, florida
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4:15 pm (until 5:00 pm)
top deck, mid ship
sail away deck party

Sail-away celebration is a
disney cruise line deck party on embarkation day. Crew members and some favorite disney characters join in the festivities.
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day 2 - mon, jan 21 nassau
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day 3 - tue, jan 22 castaway cay
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9:45 pm (until 10:30 pm)
top deck, mid ship
pirate deck party

Pirate night is a disney cruise line deck party featuring pirate-themed festivities. Crew members and some favorite disney characters join in the fun.
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day 4 - wed, jan 23 at sea
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day 5 - thu, jan 24 port canaveral, florida