The Westin SFO and Aloft SFO have a great park close by for plane spotting. There are benches and a great view of runways 1R, 28L, and 28R. The tower is 120.5 if you have a scanner. I took some pictures while out there last week. The view is great, but shooting jets almost a mile away is difficult with a hand held camera. I did see someone with a tripod and 400mm lens, a better set up than I had. It was still a fun afternoon.