Current and Dolphins
The only places I've actually been to in Mount Pleasant were the marina and the Yorktown exhibits (See also Yorktown State Park).
The marina is well run and pretty easy to find from the water (you can just look for the Yorktown), but has a LOT of current and is very exposed to wind. I saw dolphins twice right near our boat in the marina. I even managed to get a picture of them. We had seen them in the ICW before, but never actually in the marina with us.



Looking in towards Leland Marine
From walk at sunset
Charleston Museum Monitor reconstruction
Marina on a dead calm day from shore