For all you veterans who may have cruised eastern caribbean in Feb, how chilly does it get? Should I be packing more than a pair of long pants and a sweat-shirt? I know that weather can vary greatly, I just want to make sure I don't just pack all "warm" weather clothes and have it be freezing the whole trip. I also don't want to OVER-pack, which I feel I might be (going all out for Pirate Night). Thanks!