I agree about the not-so-nice-people. It's a good thing to have on your radar, but unlikely to factor into your ride much. I just biked 2000 miles of the Northern Tier alone and met countless people who stopped to talk, wanted to know about the ride, offered a ride or a place to stay etc. I even have a stack of papers of people who gave me their phone numbers on the back of a receipt or something, saying if I needed anything or if I ran into trouble that I should just call them. No creepy people come to mind at all. Not that they don't exist, but the positive interactions by far outweighed any negative ones. Between all the friendly strangers and an iphone, traveling alone was awesome, even for an extrovert.