The forerunner of historic U.S. Highway 17 once linked all 13 American colonies from Boston to Charleston. And, there are 220 miles of it in South Carolina.
The best way to do your Beach Thing is to start north and head south This means starting with the 60 miles of the Grand Strand, otherwise known as Myrtle Beach and environs. Then there is all that fresh seafood, right off the boat at Murrell's Inlet.
Next, you get to historic Georgetown. And, on to the Charleston area and definitely Foley Beach.
Then you have that Hilton Head beach scene.