Waterfront Park is where the iconic pineapple fountain is. This is a staple of downtown Charleston. There is also a great view of the Ravenel bridge which will be the backdrop of the wedding.
Another staple of Charleston. The houses are protected by the historical society meaning that the owners can't repaint without the city's approval, and if they do, it has to be the same color.
This is a beautiful place right on the water that would be great for a picnic.
If you are interested in seeing more of downtown Charleston and learning about the history of the city, doing a carriage tour is a great way to do this!