As a more-than-I-can-count-time attendee of OOW, here's a few additions to his list:
- Don't eat dinner anywhere near Moscone.
Sure, it's easy, especially after a long day or sessions, but most of San Francisco's best restaurants are not adjacent to Moscone. Head to North Beach or the Marina instead.
- Attend a session or sessions on something that you have never heard of.
You don't know what you don't know...
- Talk to strangers.
As Jeff said, this is one of the best places to network. If you don't talk, then you may as well catch the sessions online. No where else will there be as many people with similar technical interests than OOW.
- Don't jaywalk. Seriously.
The SFPD was giving out jaywalking tickets around Moscone the last couple of years, and I know a couple people who were "lucky" enough to get them. Not fun.
- Come early or leave late.
Take a day to explore not just San Francisco, but the surrounding area. Often, airlines will give you a better rate if you have a Saturday night stay included in your ticket. See if your company travel policy allows for reimbursing your hotel Saturday night if you can get a fare that makes the overall cost of the trip less.
- Download TripAdvisor or Yelp to your smartphone.
Either of these sites offer decent opinions of local restaurants and the like, and it's handy to have when you get a recommendation from a concierge.
- Visit the Union Square Hyatt's Grandviews Lounge
For a drink, dinner of only for the view. Try to get there around sunset - you won't be disappointed!