I've been planning on doing this ride for quite some time actually. There is even a book about how to do it: http://www.amazon.com/Biking-Trails-...dp/0966225902/

That sucks to hear about all the broken glass but it isn't surprising. That's why I've been so hesitant to take my road bike up there. So I guess a good question for some of the veterans would be, would a hybrid be a good choice for a ride like this?