This is what the tour boat looks like, heading out with another group:
She is about to pass under the bow of the Yorktown, CV-10, WWII aircraft carrier which is one of four naval vessels in the museum.
There are a number of other tour boats plying the river and harbor, most larger than ours:
There were a lot of sailboats in the water, and we even took a different route back so as not to sail through the regatta. This one I had to get at the long end of my zoom:

The Cosco Bremerhaven...Should I look for her later in the Kiel canal?
We arrived at Fort Sumter and debarked for a walkabout:
The walls and structures were originally three stories high, but everything was pretty much demolished by bombardment during the civil war. What is visible is rebuilding, plus all the black building construction from the Spanish American War. The fort was active until 1945 when it was given to the National Park Service.
Got a decent view of the new Cooper River Bridge, the Arthur Ravenel Bridge, completed in 2005, a year ahead of schedule. It is the longest cable stay beidge in the US, and replaced two cantilever steel truss bridges that were sweaty palm trips for me.
Visible between the ships of the museum, across the harbor, is one of the reasons for the 'cruise' - Norwegian Majesty:
We were returning about 3:30pm, so guess what was happening on board:
That's all folks! CJ