Cedar Key on the west coast of FL is a general aviation favorite.
Jekyll Island, GA is another great spot although in March it may still be too chilly for a day at the beach. But there's some interesting history on that island and you can rent a golf cart to tour the island. Or You could instead go across o the next island to St Simons, GA Where there's plenty to see and quaint restaurants.
Depending how long you want to fly a flight down to the Florida Keys is also enjoyable. Transition through Miami B airspace at 1000' down the beach and then stay low all the way down the keys!
Savannah GA would be a great overnight trip. Get downtown and enjoy the slow southern lifestyle. eat shrimp and grits.
PM me if your have any questions