Thank you for the spectator ideas everyone! The Boardwalk / Beach Club area would be great, but I think my kids will want to see me finish. Or is the finish line overrated / too chaotic for small kids? I'm leaning toward paying up for the Polynesian so that they can watch me run by and then meet me at the finish, but I do love the Beach Club.
We've stayed at both Poly and in the Epcot resort area multiple times each for runDisney races. Poly is great for those of us who are spectating and want to reach as many viewing spots as possible. As a runner, I prefer BC/YC/BWI. We also have experience with small kid spectating, so I'll comment on that along the way.
The benefit of Poly is the ability to see runners at both the TTC and then just walk over to the viewing spot outside the Poly. For half marathons, that's followed by a hop on the monorail to see runners going into epcot and then again at the finish line. For the full, the TTC/Poly is followed by bus to WWOS and then bus to the finish. But as you mentioned, they could also just see you at TTC, Poly and then hop the monorail to the finish. Our spectators can cover lots of ground when staying at Poly!!
On the other hand, that's proven to be a bit too much ground to cover for our youngest spectator. We've switched to BC/YC/BWI for race weekends because I prefer bus over monorail for runDisney events and Poly just seems crazy busy with guests and visitors. So now our youngest stays at the resort with our older teens while my husband zooms around via cab to random locations and surprises me.
My entire family does come out to see me at the end. We haven't purchased a chEAR squad package with seating, so even when my family was in the finish line area, I don't think they've ever seen me cross. For the 2017 marathon, they were in Epcot instead (park ticket required) and that was my favorite! Our youngest spectator FAR preferred the Epcot viewing location over the actual finish. It's too crowded for him at the finish, there are huge gate-like barriers between spectators and runners there, and again, he can't see me cross anyway. In Epcot, he's closer to me as I run by - I could actually hear him, read his sign, and talk to him. He felt more a part of it all. And that boost as I'm running through Epcot and near the end is really helpful!
As for random vs. planned spectating locations, I actually prefer relatively random. I don't want them to worry about getting to a specific spot in time - too much pressure for them, and Disney transportation can be unpredictable. The one time we planned meeting locations, they didn't make it to the planned spots and then I started to worry about
them. (I don't run with a phone, so I guess that problem is unique to me.) Even if I did have a phone, I just want to run and not worry about finding them. Having my family pop up unexpectedly is really fun and energizing for me. I was thrilled to see my husband at places I didn't expect on the course last year!
Good luck with your decision!