anniversary coming up -ideas?

Does anyone out there have any ideas for celebrating a 3rd anniversary? It's coming up fast (Aug 5th), and I'm fresh out of ideas. It's smack-dab in the middle of the week, so we'll probably end up doing something either the weekend before or after. Day of ideas would be nice too. Monterrey is out since we're planning to go there for my birthday. Napa Valley might be nice, but I need to check prices. We were thinking it might be fun to do something in the city (ie SF), but I'm drawing complete blanks. I guess it's back to trip advisor to try finding something fun.