Probably depends on when in March you are going. I would imagine the earlier part will have lower crowds, and later will have spring break crowds. We will be there March 16-18. Hoping for smaller crowds, but I just did a week in July, so I have experience with crowds there.
My son was there on his honeymoon this past march 9-14....he spoke with a bartender and was told the resort was at 50% .. starting on the 16th it was going to be at 95%