Pedro, Island Perk is going jam come season. It has all the ingredients to go big time. The staff are right and the location and recipe are spot on.
I do not think fresh pineapple juice will be an issue. Most businesses make fresh every day in any case.
Watch that place jam in a few weeks.
Lets face it Pedro, Jaegermeister has a long shelf life but in your place it rarely lasts two days.