St. Barts offers many opportunities to work up an appetite, from of course water sports to a all range of other activities.
Lessons and guided tours with SCUBA, with a mask and snorkle or even on a submarine.
Several bays, notably Lorient and Anse des Cayes, have suitable wave forms that are often dotted with slender, bronze enthusiasts.
Grand Cul de Sac, Toiny and St Jean have suitable wind an area to practice Kitesurf.
From big game charter boats: marlin, sailfish, tuna, etc., to dangling a string off the dock.
At last count, there were eight tennis courts.
St. Barths' most popular sport, with frequent tournaments.
Fast towboats, and knowing where the water is flat.
Kayaks and peddle boats, available on the beaches...
There are numerous trails to and from out of the way places.