My dh and I will be cruising using our passports to check in. My two dds ages 4, 7 months will be cruise with just full size birth certificates with raised sails from city hall. Dh and I will also have regular id (license) with us. When we get off the boat for excursions can we just use our license ids and all of our key to the world cards. I have a waterproof box that I could keep them in at least while we go swimming. I assume I could keep the passports/birth certificates on board in safe if I did this but not sure if this is an option.
