Legend has it Peace Rock goes down for a swim ever Easter. Was it wet this Easter?

Flip-flop,

It's part of PR and you can get there by plane from San Juan - the flight is worth the cost of the ticket.
It's very small and laid back island with guest houses and a few small hotels in the town of Dewey.

Check out http://www.culebra-island.com/index.html

I've been to Jamaica, STJ, STT, Jost, PR, Culebra and Bonaire.

Hands down the best after STJ is Culebra - low key and great snorkelling, of course YMMV.