I see a lot of good stuff in these posts, but EDC (Every-Day-Carry) should be minimal in this environment. This is a cruise ship for folks on vacation having fun. A lot of the items I see in this thread would be good for a Go-Bag based kit that stays at the ready in your cabin/stateroom, but to carry all this stuff every time you leave your cabin would be extreme IMO. The idea is to relax and have a good time. My $.02, YMMV