Good list Marley, I would also add -
Not too far from Negril:
Half Moon Bay
Sav-La-Mer on a Market Day Fri or Sat
Roaring River on the way to Mayfield Falls would make a good full day outing
Jurassic Park?
Bit further out -
Black River boat tour
Bamboo Avenue
Bluefield Beach and Belmont
Lovers Leap
Big ups for Percy's Retreat, Mayfield Falls, YS Falls, Pelican Bar and Bluefield.