Hi Bill and Pam,
Yes, we did that and had a wonderful time, you learn a lot of sailing tips, plus you are in an actual race. I would recommend it, and do sign up early, they do fill up fast, they only have so many boats. You can pick a more or less active job, so its up to you, I did the job of a main grinder and it was some work involved, but it was worth it, we WON!
Question for you: we will be there the day before our wedding in St John. I'd hate for something to happen - get slapped in the face, hurt a hand on a rope, etc. Is there any danger of that? I read somewhere that you are actually part of the crew, but do not want to have any physical evidence of that the next day at my wedding! Can I still participate and be okay? (Yes, I'm am over-cautious... but only on the days preceding the wedding!!!)
I guess there could always be a chance of injury, or for me I was a little sore the following day from the effort. In that case you can take a job less active, cheerleader, bar maid, etc. Its still great fun and worth it!