Hi David, Your ports will be crowed especially St Thomas so for excursions I suggest check the HAL site and also www.shoretrips.com and chose what interests you. I can recommend the Royal Dolphin Swim in Tortula. As for Half Moon Cay it will be exclusivly HAL excursions para sailing or beach horse back rides are always in demand.
We just lie on the beautiful sandy white beach and swim in the cool blue/green water on Half Moon Cay.....
If this is your first time to St. Thomas you may want to do a tour of the island or go to one of the beaches. If there are a lot of ships in port, then it will be crowded in town and at the beaches. Looks like there ae 4 ships in that day, but I don't know where the Westerdam will be docked - probably Crown Bay.
I will be on this cruise also. I booked the stingray encounter on Grand Turk and horseback riding on Half Moon Cay. I may just get off on Tortola and St. THomas to have a look-see, but I plan to enjoy the ship even more. BTW, I posted a Meet on Board topic on Westerdam 12/16 a while ago--why don't you check it out?
I just finshed a contract with Holland america. I went to those same ports. They are all wondrful. However Half moon Cay was the best. Make sure you wear lots of sunscreen at Half moon cay. There isnt much shade. St. Thomas the water is crystal clear. I really enjoyed the beaches there. Grand turk is also very nice. The people there are very friendly and its very clean there as well.