I've never stopped in Savannah but if you're staying there I'd check out Tybee Island, it's a really cool place, I'll be down there for July 4th weekend
The Colonial Park cemetery is cool. And of course river walk. Don't forget Savannah is an open container city. Grab a drink (in a plastic cup) and go for a walk around the city.
City market is neat. And has a Great pizza joint on the corner.
We've bounced around but we've finally landed at the Best Western for the rest of our stay. We hung out at the beach today and drank beer. Finished it up at The Crab Shack. I think we're getting ready to take a stroll and check out the river.