If you have had too much of the sea, spend time enjoying the sports facilities available on the island itself.  
A well kept and lush grass soccer field is to be found inland.  Good for a kick around and for the occasional guests versus staff matches.  
The Kani volleyball court is another place where you can flex your muscles and enjoy the adrenaline of competition. There is a beach volleyball court too.  Badminton, table tennis, or a good game of tennis (under floodlights), billiards, a football table game, and indoor board games are other options.