I will heartily second Sunset Beach. It's just a quiet little island with basically just beach houses...also a couple little shops people like to walk to and the pier...but is also within easy driving distance of Myrtle Beach when you want a little more action. Although, I'll be interested to see if it is changing since they replaced the floating pontoon bridge with the causeway. Used to be you had to time when you were trying to get on or off the island to make sure you didn't get stuck at the bridge. It probably helped keep it as low key as it is. We're actually going down the last week in July after I get done here for our annual extended family trip, but I think this may be our last year because the 12 hour trip is just too much.