I agree with most that have already been touched on (location, ease for a land tour of the island, restaurants...). I might add that the staff there usually seems pretty friendly. We usually pick up some provisioning items that we missed at the start from the store. And while it doesn't apply for everybody, Bean's is a plus too.

And for full disclosure-I've never met Nick or his wife...sometimes it seems like I'm the only one here who hasn't! <img src="http://www.traveltalkonline.com/forums/images/graemlins/Yikes.gif" alt="" />