Matt
You have being givern some good information in the previous posts
I have stayed on Tortola several times and had some great fly-fishing wading from shore. However finding, approaching and getting the fish to take the fly can be very challenging.
Having said that, if you figure it out, the fishing can be great.
I have caught mainly tarpon, but also bones, snook, small tuna, various little reef fish.
The biggest Tarpon landed was in the 50lb class but I have hooked them faaar bigger, that either broke off or threw the hook. I have snorkeled and seen pods of tarpon 5 - 6 ft long corralling bait fish (small anchovy / pilchard) I think.
Early in the morning snook can be right in the surf 2 feet from shore.
I use 8 and 10 wt, clear int. and floating lines with a long leader.
Rays fly’s (Ray Bondorew) between 2 - 4 '' worked very well, very easy to tie, see
http://www.stripermoon.com./flyarch/arc1.html
All of the bays have tarpon at times. The biggest flats are on Beef island (bridged to Tortola) there are other flats all around Tortola where I have seen permit (unfortunately while doing attentive husband / family man duties)