In agreement with TP, the Sandals bus really isn't going to stop, everyone is far to interested in getting to the resort. Only a short beer stop and then back on the road. The last trip to the WH no one wanted to even stop then, so we went directly to the resort.
I am not a big rum person so I don't know the answer to this one, but, can you buy it here in the US and pack it in your checked luggage? Anything would be cheaper then buying it at the resort gift shop.
Do remember the Duty Free though on your return trip home. I drink Crown Royal and the same bottle in MN costs $32, and I usually get it for $17.50 at the Duty Free in the airport (2 for $35 in January). I generally get four bottles each time. Just used two of them at a party for gifts, everyone went crazy!
Have fun at the WH.
Edited: 8:08 pm, May 15, 2011