Yes, I got a day pass to the Sandals Grande in Antigua on our Southern Caribbean in 2008. Basically you get to use the pool, unlimited drinks at the swim up bar, and one meal in a restaurant. It was very nice. I;m not sure the proceedure to get a day pass now, being a TA myself I just contacted my local Sandals sales rep here and she hooked me up with the day pass. You don't get a room or anything, just use of the public restroom with a shower in it to change. As I recall, the taxi fare was like $20 total for both ways.
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Scott
Majesty of the Seas - 10/03 & 02/07 & 11/08
Enchantment of the Seas - 10/04 & 10/11
Mariner of the Seas - 10/05
Vision of the Seas - 10/06 & 09/07
Carnival Liberty - 10/07
Adventure of the Seas - 9/08
Ruby Princess - 12/09
Voyager of the Seas - 9/10
Carnival Spirit - 11/10