St John, St Lucia, or Costa de Sauipe?

[glatt]

Of the three, I've only been to St. John. I would never use the words "hip" or "happening" to describe St. John. Don't get me wrong. I liked St. John a lot. It's mostly a National Park with spots here and there that have resorts. I like National Parks. Nature is pretty. I'd say it's relaxed there. If you want a social scene, I'd guess one of the other two places would have to be better.

edit: I did not stay at the Westin, so maybe there's enough at the resort there to keep you occupied.