Suggestions for Charleston?

I'm heading to Charleston, South Carolina on Wednesday for the second half of Spring Break.

I'm set to compete in the John R. Brown Admiralty Moot Court Competition with a crack team from the Tulane Maritime Law Journal.

Any recommendations?  I've never been to Charleston (or South Carolina, for that matter).  I'm not sure how much free time I'll have, but Fort Sumter is already on the list.