You can REALLY Do what you want, you will not be out of place, I think it is interesting on these boards the people that get so uptight on the "suggested" dress guidelines, I dress up every day of my life in a suit and a tie, and dont really want to do this on vacation. I have gone in in resort causal and not felt out of place.
If these people want to sit in judgement on dress, then I will offer my 2 cents. Many of the people who think that they are dressed up with ties and coats, go buy new clothes, sansabelts, and a tie look far worse than a nice shirt and jacket or a tie and no jacket. My last cruise people who thought that they were "dressed" looked pathetic.
It is your vacation do what you want, dress comfortably.