So sorry about your Dad..lost mine 5 years ago, but still have Mom, thank goodness...he would never have made it without her, so I feel your pain..hang in there..AC is a magical place, you will have a good time. Have never been to AC in March, only in September,but we have traveled to the Carribean every January or February for the past 8 years and we have never felt the need for a jacket at night, but if you tend to get cold easily, I would take one..we usually wear a very light weight jacket when we leave home in Kentucky (we usually have kind of mild winters)for the airport, but never end up wearing them until we get home. First trip to AC?