We did sign up for that in Nassau, but because of weather conditions, it was cancelled. Since then we did get to do it in St. Maartens. If its anything like the one in St. Maartens, its great. I did read that the boats are new/better in Nassau. I'd definitely suggest going for it, it was a gas! Hey, we actually won by a nose, it was not
easy, but well worth the cost, have fun!
PS: You'll love Explorer, so far, best cruise for us!