Didn't Rocky give you a rough time line of how long you'll have at each spot? It will depend on what time you leave Negril and what time you want to return too as to what your time frame might be - don't forget, you'll have to factor in road time travel between each place. He should have given you food suggestions too. If you're short on time getting in the three attractions for the day, at least make a stop in Middle Quarters where you'll find all kinds of local foods - just about anything you can imagine. You'll always find rum at the Pelican Bar and either sodas or water to mix it with. Tipping the boat captain is up to you amount wise - as with car or van drivers, I tip more for someone who actually has some sort of conversation I learn something few from rather than someone who just sits at the wheel (or rudder?) and drives. If paying in US dollars at the Pelican Bar, from what I remember, sodas and waters averaged about $2 each and beers were about $3 each but someone who has been there this past year can verify if prices are still the same.