lemme see - All inclusive indicates that the management/ownership will be
lowballing on a lot of the costs, one of them being alcohol (trust me - x club
med employee here). This means that your high dollar alcohols will not even
make an appearance. This is a vast generalization, please forgive me.
I would try:
1 blender filled half full with super cold, chiped ice.
fill to ice line with frozen-slushy milk
add enough vodka (your guess is mine here)
vanilla (comes prety cheap in Mexico - closer to the source)
chocolate syrup or coco & sugar ( also close o the source so quite
inexpensive.)
Blend till you are done.
This is probably not the stuff though. More than likely it is milk or cream
or reconstituted dry milk, vodka, vanilla and chocolate all shken up and
frozen to a slushy stage.
Experement little at home before your party to come up with something
simmilar. Do try vanilla ice cream and drop the vanilla and some of the milk
out of the recipie, add it all to the blender and give it short bursts of
blending so it doesn't liquify too badly.
These are jsut shots in the dark! Good luck to you (And happy vacationing)