You're not going to be able to cover everything, so think about the shots you really want, and figure out how to get those.
A few random observations:
* Everyone has to cover the area from S/F to the 5K turnaround, but only the 10K runners go on from there, so if you're past the 5K turnaround, you won't see *any* of those guys at all.
* Runners will be tightly-packed near the start, and very spread out at the end. Do you want shots with lots of runners in them, or isolated shots?
* Water stops can have little flurries of activity -- find out where they are, if you can.
* Pay attention to backgrounds -- no matter how many runners you have in the frame, you don't want to wind up with all sorts of distractions in back.
* Emotion, to whatever extent you see any at all, will probably happen near the end.
* You might see some interesting "lifestyle" shots before and/or after the race as runners & volunteers mill about near the S/F line.
I think if it were me, I'd scout out a spot or two with great backgrounds not too terribly far from the S/F line, get some shots before the race, then get to a spot to shoot the start of the race. Get some crowded shots on the way out, then maybe catch runners one at a time on the way back. If you think there's a chance there will be any sort of crowd at the finish to cheer the winners, that might be interesting, too. With any kind of event photography, the more you know about the event, the better you'll be able to capture the emotion in your photos.
Think of it like a TV commentator doing a ball game -- you want to listen to someone who knows the game, because they'll have relevant thoughts to contribute. That's your job -- get to where the relevant stuff is going to happen before it happens, and then get the shot. No sweat, right?