If you post a cuisine and a neighborhood you'll be in to that thread, someone will likely help you. There are plenty of cheap eats in this town. The downtown option provides plenty of "urban hiking."
Across the GG to the north there's a ton of hiking in the Marin headlands. I haven't really scanned this, but it's a start:
http://www.marintrails.com/index.html
You are very close to Pacifica. A nice spot for beginner surfing there. You aren't too far from Half Moon Bay, and there's some hiking options there. There's a short hike around "lands end" that starts out of a parking lot just above the Cliff House. You can easily cut through Lincoln Park GC and explore the Legion of Honor.
So do they have you guys on the Ocean course to?