15 YOA is about the time they get bored and want to do their own thing, and be with friends! This is not the 70's.......we are an electronic society, allow them to bring their tech stuff!
Cycling trails, zip lines, kayaking, paddle boards, snorkeling, rafting, tubing, sking,......all fast paced outdoor fun stuff!
Trying to force a teen into grandmas board and card games...........Zzzzzzzzzz. If they like it great, but forcing them because you did it 40 years ago.....or grandpa did it 60 years ago??
It's their vacation too, let them relax and have "their" fun!