Tell them to check out blue cave mineral pool.. I think that's what it's called. It's listed on Trip Advisor as the number one 'other activity' in Negril. You take a ride out through the peaceful country to get there and they have a huge cave that's in the ground that you can jump into from ground level. Water is clear and clean an deep! They have a nice in ground pool fed by mineral waters as well and a bar with food.

Place is great.. most 11 year olds should love it.