I was there about 5 years ago. All the fishing is done out of the main marina. They basically start fishing about 1 mile outside the harbor. They're mostly trolling ballyhoo with skirts. Went out twice.... 20 or so wahoo, 5 or 6 dorado, some barracuda, and a double hookup on Blue Marlin. Really good place to fish.
The wind picks up around 12.... every day. The water is usually pretty rough. If he's got his own rod/reels, he may want to take them. You have to check out the boat thoroughly. One of the boats I was on....... wasn't too sure we'd actually make it back.
Can't remember the name of the boat, but owner/captain of it also owns a resturaunt there on the island. Nice boat, great deckhand. That's the one I'd be on the next time.