During the day there is quite a variety of watersports. If you are interested in scuba diving there are several opportunities to learn how to scuba dive. Many other watersports are also available such as parasailing, windsurfing, kitesurfing, jetskis etc. If your age restricts you from renting a jeep (although perhaps you could still enjoy this with an older person) you could still get around on a four wheeling tour (ATV) or on horseback. As regards nightlife, to enter most nightclubs and bars you need to be 18 or older, but there are places where you can go in the hotel area where you can also enjoy live music most days.