Old subjest but since I saw it first hand on the Dawn this Nov I will share what Princess does.
Each day in the Princess Patter they put a big notice reading: Do not save seats for shows or the pool etc. Then they follow it up atleast pool side by collecting any loose towels lacking shoes or clothing etc that indicate someone is actually in the area.
oh really! Saw the notice but didn't see anyone moving those towels! Last week a family group of about twenty saved the whole length of the pool in chairs daily. I think they thought they owned the deck. Everyone knew of them.
I finally got fed up of having no where to be comfortable while I watched my son swim and moved one shoe, the other was saving another chair as were other articles, and sat down. I think they got the hint. No one sat in the other five chairs closest to me for at least half an hour to an hour.
I never understood this gripe before this cruise...I can see where real sunworshippers would get annoyed (we didn't have much sun to worship this cruise).