Okay, thought a little more about the 1/2 marathon day, and with the races starting at 5:30, you could walk through Epcot back to the resorts if your finish time will be more than 3 hours. Honestly though, by the time you walk back to the front gate from the finish area, walk through Future World and to the International Gateway, you'd be back at the hotel via bus before that. The resort marathon bus loading area is right beside the finish/reunion area. You aren't having to walk back to the Epcot bus depot.