Sunday marks the annual San Francisco Marathon. The entire run will take your 26.75 miles if you do the complete marathon run. For those less inclined to race the entire run, there's a 5K run. There's also a kid run for wee ones looking to get their cross-country training on.
Course map below:
If you want to feel as if you're running along with participants (while lying at home with donut powder on your lips and a hangover beating in your head), you can followed along with this pretty cool fly-over map.
Traffic in the surrounding areas, if not in most of San Francisco, will be a veritable nightmare. Until noon. Please be advised.