Jennifer and I went to San Francisco for the Red Bull Air Races, and Feel Week Airshow. The plan was to park far out, and rollerblade to the Marina.
The Red Bull races were pretty impressive, the pilots had to negotiate a very tight course between inflated pylons. Not only that, but they also had to be crossing them with a 90 degree attitude, pulling up to 10Gs in the process.
You can see a video of the winner

The Airshow and the Blue Angels were quite nice too.

If you'd like more, see the rest of the pictures of the Red Bull Air Races and Fleet Week Airshow