1. I doubt most stay onsite. Not enough rooms. I noticed getting out of the parking garage is a disaster after races and it impacts ART. Lots of locals. The start/finish is very close to the Disneyland Hotel. The walk to the corrals is shorter but they make everyone go through a narrow gate and that causes an annoying bottleneck. 2. My feeling is no. Not really sure. 3. I didn't run 2017 but 2016 had at least 3. 4. All three onsite hotels are walking distance as is Harbor. Anywhere else you will need to take ART. They do a good job in the mornings and you get a free weekend pass at the Expo. ART will be impacted by race traffic afterwards. 5. I stay at the Holiday Inn on Walnut & Ball and it is walking distance. They are also on ART. IMO this is the best offsite location for race day access, but not great for park access. Sometimes I walk to the parking garage and take the tram in. If you are by yourself, Harbor might feel like a safer walk because of all the other runners. Walnut feels safe but it's dark and not as many people going to the race. 6. Yes and yes. It can get crowded. Hope that helps. I'll be running next year.