After leaving Savannah, stop at Jekyll Island, GA (Exit 29 on I-95). Lots of history on Jekyll Island and many miles of walking and biking paths. February can get chilly, although the last couple years it was nice. March will be very nice weather. There are a couple restaurants on the island, but a short drive (15 minutes) to St. Simons Island will offer a lot more dining choices, including some fine dining. There is also Fort Frederica National Monument on St. Simons Island. Both Jekyll and St. Simons Islands are barrier islands with beaches. Jekyll Island's beaches are nicer.
-Michael