Okay, I just signed up for my first organized ride--50 miles. Requested the time off and everything. I haven't ridden on roads in two years, thanks to living in places with really nice bike paths with a 20mph speed limit.
Anything I need to pick up beforehand, besides food, obviously? I was thinking a mirror (any recommendations?), and perhaps a daylight-visible tail light (I think the Planet Bike Superflash fits the bill).

