Based on your description, I think YS & Pelican are the best for you.

Mayfield is not your "movie waterfall", but YS kinda fits that bill. As PGW said Mayfield is more of a riverwalk with small falls and rapids you walk through.
Blue Hole was fun, but was more of an afternoon outing... not really a true days excursion in my mind as there is not much to do there.

In reality you might even be able to hit Pelican, YS and then Blue Hole on the way back to Negril.