my thought is to go right to Catcha and ask them to hold your luggage until your room is ready

my other thought is, why are you limiting yourself to just that transition time to get to the long bay beach? sounds like you have at least a week to spend time ALL OVER Negril. Just go with the flow. When you need some beach time on the long beach, catch a cab - my thought would be to do it while you are staying on bloody bay, and then just (full)joy the cliffs. It'll be like two vacations in one!

Just my opinions!