I have a book called "St John, Feet, Fins, and Four Wheel Drive" published in 1994 that is probably still fairly accurate. The times are from that book.

My recommendation is the Rams Head trail out of Salt Pond Bay. It has the best views. Hiking time is 45 minutes each way.

From nearby Lameshur Bay, you can hike to Reef Bay., about a 60 minute hike each way.