My DH, DD (9) and I are looking forward to the new stamps we can get in our passports on our upcoming Western Carribean Cruise. We plan to get off at each port and walk to the office to get the stamps. My in-laws will be traveling with us, but will not want to walk the long distances. Will we be able to carry along their passports to get them stamped or will they need to be present? Thanks for any helpful info.