Sorry to hear of your poor experience.
At what time did you travel? Was it recent?
We are planning our third trip back in a few days and we have never experienced a dirty beach or smelly ocean water. The weather was very warm and any breeze that may have been blowing at times was very welcome as the sun was quite hot some days.
I cannot believe that nobody ventured into the ocean. I realize that it is not the carribbean, however, as I mentioned the times we were there there was many people in the ocean and pool as well.
It sounds like you stayed at a totally different resort. Perhaps you could elaborate on the beach area. I know that away from the hotel the stretch of beach does have alot of debris laying around but never directly in front of the hotel itself.