Save yourself the frustration and split your trip; the goal is to have a good, memorable experience; not one that a blur. You might consider doing one section only. What is the point in visiting a place and not stopping to do a few things, seeing a few sights, etc. For example, one year we did the Port Maria, Port Antonio & Blue Mountain trip.That alone took us at least 12 hrs. It included visiting Firefly, visiting the Blue Lagoon, Rafting the Rio Grande River, and driving up the Blue Mountain to Mavis Bank.