Here is what I take from all of this. At the very least I will wear slacks and a nice collered shirt. Proabaly can get away with a nice golf shirt but a short sleeve or long sleeve sport shirt is probably better. Sport coat without tie works well and I can absolutley get away with no tie. As far as going to the Lido if you don't wear a tie or jacket--I do not agree. You can. Carnival's policy resulted from the practice and sounds like a nice compromise.