Not to stray to far from the original question, but I just wanted to say that after discussing it with the CMs involved (on the phone beforehand and in person on the dock) we let our severely allergic son take part. They had a safe snack available for him, had him wear a band on his wrist with his multiple allergies and our cell numbers written out, carried his epipens for him and they had a pediatric nurse as one of the CM pirates (not sure if that was planned as a result of our communications, or we just lucked out) - DH and I were nervous the entire time, but he had a blast and was so proud to have gone off on his own. OP - If it would meet your needs, perhaps you could request a medically-trained CM be part of the crew if one is available?