Run a marathon

I ran the Dasani Myrtle Beach Half-Marathon back in 2006, and the idea was that it would be a stepping stone towards running a full marathon. That didn't happen, but now, four years later, I'm training for a half-marathon once again -- the same one in Myrtle Beach (it's pancake-flat and the weather is generally perfect when it's being run). After that, I want to keep going and finally knock off a full marathon. Where to go? So many marathons, so little time.