Hi Ryan, I agree with the others. It's a good idea to not try to plan too much for your first trip. Just give yourself the freedom to go with the flow.
Are you staying on the beach or on the cliffs?
I recommend Best of the west for Jerk Chicken on the beach end and "3 Dives" for Jerk chicken on the west end.
Ricks Cafe is worth a look-see just for the jumpers and sunset. The drinks are overpriced, so I would recommend just nursing one redstripe like I did. lol
Ivans at Catcha Falling Star is great for a fancy night out for dinner. (amazing food)
I haven't gone snorkeling with the Famous Vincent yet, but I definitely want to on our next trip!
Xtabi is also great place for Snorkeling off the cliffs.

I'll be going to Pelican Bar/Ys Falls for the first time in April too - If you're going to be traveling to Negril at the end of April, you should jump on the Magic Bus with us. April 24th! Check the April Roll Call for more info.