Call the Sand/Ocean Dunes Resort in N. Myrtle. They have three story townhouses that we always stay at when we go to Myrtle. There's only ten of them so you need to make your reservation early. They are three stories, three bedrooms, two beds in each room, and a pull out bed from the living room catch. Very nice.
I'll be staying in one from the 23rd to the 26th is someone needs a place to crash (floor room only).. also.. there's a parking garage on the premises (since i'm sure most don't want to park on the street). Lastly, their hotel rooms are awesome too (sand dunes, and ocean dunes).