There's a discussion going on at Cruise Critic regarding passports while cruising, specifically whether to take them with you or leave them in the cabin when you go ashore.

An alarming number of people (to me, anyway) say they leave their passports on the ship when they go into port. This just seems like a bad idea to me, if only for the possibility of missing the ship and having to find our way home.

What do FT cruisers do? It's probably obvious from my post, but my wife and I carry ours with us every time we go into port.