You and some of your friends would probably like a day tour outside of Negril to see some of the Jamaican countryside and its people. Two of the most popular tours on the South Coast are:
Mayfield Falls-SavLaMar;
YS Falls-Black River-Pelican Beach Bar

Links to reliable tour operators are:
http://www.rockystaxiandtourservice....excursions.htm
http://www.clivestransportservicejam...HighlightTour1
http://chickensmagicbus.com/


As you are already booked with Clives for airport transfers, I would check with him first as he will probably give you a good deal.

Enjoy your stay!