If you are staying at the Hyatt, the 211 Bus Line picks up right outside the hotel on Spring Street. The 211 Bus comes every 15 minutes or so. The 211 Bus will take you down King Street to Broad and Market streets if you'd like to ride (rather than walk) to the historic market and rainbow row areas of downtown.
First time to Charleston? Learn about the city's history on a carriage ride around downtown.
Just south of the Francis Marion hotel on King Street, you'll find a ton of luxury shopping. The further south you go, you'll get to more tourist-type shops around King Street Market.