Travel Expense Question

We have a primarily online Golf Retail Business near Canada. In the winter there is no Golf where we live and we pick an island where we travel too. While there we promote our business by talking with golfers we meet around the island, distribute marketing materials (cards, stickers and such) and meet with pros and pro shops, we also golf and run our online business from where we are staying. 

 

We do not "Move our business" to the Caribbean as our shipping is still being done out of the US. 

 

As we are working everyday. What type of documentation do we need to write this off as a business trip.