my husband and i split our honeymoon between blue mountains and negril.

what we did was we flew into kingston, went to the blue mountains (LOVED strawberry hill), drove back down to kingston, took the knutsford express to negril (great ride, reasonable price) and flew home out of montego bay.

i would recommend you do similarly- fly into kingston, take the kuntsford express (or private taxi) to portland, arrange a ride to negril then fly home out of mobay.