It's definitely closer to the falls, so not at all close to Negril, however I love them too and agree it is worth the trip
If you stop at the sisters see if they have a pot of their peppa shrimp soup....OMG that was the best thing I have ever tasted

But while in Negril, Pushcart Restaurant (at the Rockhouse) also has Peppa Shrimp on their menu and they are pretty good too! (And BIG)