I’m heading to the Virgin Islands next week! When I was there a few years ago, I drank lots of delicious frozen alcoholic drinks; my favorite was Lime in the Coconut, which I just calculated at 59 grams of carbs carbs in one drink. 
During my vacation I’m not going to excel at keto, but I would like to keep my carb count reasonably low and not blow the entire day on one drink. What are some good lower-carb alternatives that still shout “Caribbean vacation!” without being chock full of sugar? 
I don’t drink myself, but if I was in your shoes, I’d probably pack a case of this, and get the waiter to toss in a shot or two of vodka…seriously doubt there are many tropical drinks that aren’t carb-laden:
http://www.drinkbai.com/cocofusions/molokai-coconut
Love that stuff. Shame it’s so expensive.
The Bai is bliss, it would be an awesome tropical drink!
I’ve gotten into the “tiki” subculture the past year, and ya, it’s a drag that so many of the drinks are sugary. At a resort you probably won’t have the sugar-free versions of mixers, but here is a good thread to use as reference: http://www.tikiroom.com/tikicentral/bb/viewtopic.php?topic=40732&forum=10
Corn & Oil should be pretty low carb: http://punchdrink.com/recipes/corn-n-oil/ and a Planter’s Punch woulnd’t hit too hard: http://www.seriouseats.com/recipes/2010/07/planters-punch-cocktail-recipe.htmld