If you arrive early for your flight, don't go through security yet! Go upstairs to the airport bar. Sit outside. Watch the planes take off. Way sweet unlike anything I've been able to do @ any airport
Like the other tips say, head up to the second level via the stairs and have a seat at the bar or go outside for lunch and a great view of the planes landing and taking off.
if you can fly out here rather than san jose...definitely a do! There are five people in our "gate" and one person in front of us at security line...on a friday!