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So many Questions...so little time.. I have not sailed the century so can't help you with the room thing. Theme nights generally are a thing of the past on Celebrity. Likley will have a tex mex deck party and purhaps a caribbean night. It's not like the old dress up particiapate days of yore but you could take your pirate costume and fit it in somewhere I'm sure. Those cruise staffers are always looking for someone to liven up their functions. I shud say that we usally travel on longer trips and if you are just going for a week tings may be a little more active. Use of the pool depends on what ever/who ever made the arrangements if it's tied to the room use it will be for the entire cruise. Weather shud be sunny and hot and you're getting into the start of the H word season so the captain may take you elsewhere if there is a problem. Won't bother you much regardless of what happens. Enjoy...