Here are some maps to help locate things (click on any of the maps for a larger version):
an overview of showing Savannah and Tybee Island -- Note: this is a large image!
Downtown Savannah showing what I believe is Hwy 17 (Talmadge Bridge) to Hwy 80/26.
Overview of Tybee Island
Reunion event locations (Captian's Row Cottages, Memorial Park, DeSOTO Hotel -- where the main Hendry contingent will be staying).