Personally, I'd rent a car from www.islandcruiserjamaica.com and load it up with 5 people, go to your hotel and ask for a recommendation of a good guide, and head out on a fun and enjoyable journey. The journey is as fun as the destination, you get to stop whenever you like,to enjoy the local scenery and food (Gluttons Corner, just after Whitehouse) for awesome soup.
If you want a recommendation for an excellent Guide that won't shaft you, go to JB and ask them to send a message to Chris of Roaring River, he's an excellent guide.
The picture below was taken just outside of the place where you take the boat to Pelican Bar in Perotee bay. Chris is on the right holding the lobster..
