In 2014, we took our four grandkids for their first trip to the BVI. I created a manual, giving them each one chapter a month between Christmas and June, to let them know what to expect. Here is a link to the generic versions, in Word and pdf.

(Grand)Kids Crew Manual

Feel free to use it if you think it might be helpful.

There is also a long thread here with regard to that trip, that may give you some additional helpful information pertinent to your kids.

The BVI And (Grand)kids