If you have been to Negril in the past 5 years and enjoyed yourself, this time should be no different. I think that the food is quite a bit better than "survival", but then again I'm into local people food, not high end dining. And like you , do not drink or smoke weed. However there is a lot more to do in the Negril area than sit on a beach. I always am on the lookout for new things to do and see and get bored quickly sitting on the beach. Try some of this stuff for something different and memorable while in Negril.
Friday or Saturday route taxi to the Sav market, take your camera.
Mayfiled Falls
Rockland Bird Sacntuary
Walk up into Red Ground especially some of the samll off shoot roads. Amazing who you might meet.
Try to hook up with Markie the cave man in Red Ground for a fairly cheap tour of a great cave we used to play in back in the 70's.
Horseback riding and swimming with the horses at Rhodes Hall Plantation.
Take a route taxi for the Friday or Saturday market in Lucea.
Route taxi day trip to Half Moon Beach just to be alone.
Check to see if Discovery Falls is open, not far from Negril.
Respectfully check out a Sunday church service.
Notice I didn't even mention any of the normal stuff that tourist try to get done but never seem to get around to?
Regards,

Bob