We're taking the RCL out of Ensenada, Mexico on Nov. 4th. It's four days at sea until we get to the Hawaiian Islands. Never been at sea for such a long duration. Any advise on how cold it might be at sea (so we can judge what to pack)? Can't imagine that it's the same temperature as on land, but, again, I've never done it. Also, I've been reading other notes, but have not seen anything. Thanks for your replies!