What to Do, What to Do?
The Charleston City website is a great place to start.. You can also check out the outdoor markets or take a stroll to the the SC aquarium (for all you fish lovers). We also hear the the The Battery and Fort Sumter are great historical locations.
You can also look into taking a ghost tour if you are in for a little scare (people from South Carolina are a bit superstitious). If you want something more relaxing take a harbor tour or one of the plantation tours, including Magnolia Plantation and Drayton Hall.
Almost anywhere you can find horse and carriage tours. Good means of transportation if you want something romantic.
As for the wonderful world of cuisine, well Charleston is heaven's gate to seafood. Take a gander at the Tsunami Sushi, and Cru Cafe. Also, you can take a look at where the reception dinner is going to be, The Wreck, as far as we are concerned the best seafood in town.