The ponds on the Marriott golf course at St.Kitts are full of tarpon and they are willing takers on many patterns but I had the best luck with a large shrimp pattern I designed for winter steelhead in the pacific northwest believe it or not.
It's essentially a GP variant tied in orange. They responded to other flies but attacked this with abandon, repeatedly if they missed it the first swipe.
As important as the appeal is the ability to withstand the rock jaws and penetrate the tiny seams and cracks in their armour mouth.
Luckily I had a couple of these flies tied on heavy irons, other flies I tried were opened straight on the first jump.
Also I ended up cutting back the leader until I must have been fishing 40# tippet and these were 20-40 pound fish with one in the 60's that I had no prayer of landing.
I jumped 11 and landed two.
IFFF Certified THCI @ 2005
Capeflyfisher Guide Service
Island Hopper, Guitarist, Incurable Dreamer
and Founder, Worldwide Flyfishing Forum