First Time with Teens. Fun Beach?

We will be in St Kitts on our cruise in February. We are family of five...ages 52, 50, 21,19,16.

DH and 19 and 16 year old are doing the zip line tour.

My 21 year old daughter and I want a nice beach for the day that the others could meet up with us after their excursion.

Do any of the beaches offer jet skis in case they decide to do that?

Any you would recommend over another?

Any help or suggestions would be great!

Try Cockleshell Beach on the far end of the island or South Friars Beach closer in. There are vendors offering most of the water toys( motorized and non-motorized).