Hello, I've been back for about a week from my destination wedding in Punta Cana, I thought I'd share what was used from my OOT bags (actually did OOT travel mugs instead). Our mugs were 22 oz from Discount mugs.com so they fit quite a bit inside.
the travel mug
SPF chap stick
gum (on the plane for taking off and landing)
Nutrigrain Bars (early flight, not everyone had time to grab breakfast)
Chocolate bars (all inclusive, all you can eat, but sometimes you just want some real chocolate)
pepto bismol chewable tabs
welcome pamphlet - mostly for common spanish phrases
Emergen-C powdered drink
Not used or not mentioned:
propel powdered drink
sanitizing hand wipes
My advice...don't go overboard. Nobody wants to lug around a bunch of stuff on thier vacation.