It is crowded but nowhere near as bad as Easter or the weeks around it..We go down most Marches, and this year we went right before Palm Sunday, it was packed!! Crowds will also depend on what time of March you go, early March will be less crowded and crowds will increase during the month as the kids hit spring breaks for college and school...I love March down there, even though it is a bit more crowded, things are open later and it is a lot of fun after the dreary winter months....