Play Bradley. It's great. And Nevin. And Renny. And about any of the others, as they're great too. I'm not a huge fan of Smith, but that's just me. It's good, just not my favorite in the area. I'm probably a little biased about Bradley, as I helped design it, but I think it's a bit overlooked in the depth of good to great courses in the area. Probably my favorite course in the greater Charlotte area is the Scrapyard, for what it's worth. But that's a little bit of a haul from G-Town if you're on any type of tight schedule.
I'm also a big fan of Goat Island, when it's dry. It's probably not too dry out there at the moment though.
Also, you could probably play Bradley, Rankin, and maybe River Street too in the amount of time that it would take to drive from Gastonia, to play Nevin or Renny or Scrapyard, and drive back to Gastonia.