Kate I did the half marathon this year solo. Although after the WISH meet, volunteering for the full with Tracy, Brian and company and taking some WISH'ers into Test Track, I don't consider it solo!
You can be as alone or as together as you want. Me--I prefer doing some things solo, so I enjoyed the trip a lot. It was a good balance.
And since the half is now full, I will have to do the marathon or nothing!
Maura