1. Amazing Art Collection
Art is now fairly common in modern airports, but SFO has a really fine collection. The airport commissioned 17 major works for the International Terminal alone, and strolling along the walkaway above the waiting areas is a nice way to kill time there. The recent remodel of Terminals 2 and 3 have provided the opportunity for more installations by local, national and international artists.
2. Changing Special Exhibits
While many airports offer little more to look at than racks of T-shirts, SFO has 20 different special exhibit spaces throughout the airport, both pre-and post-security. San Francisco was the first airport in the country to have a permanent accredited museum. Current exhibits include a huge display of costume jewelry by Joseff of Hollywood, Jeweler to the Stars (pre-security in the International Terminal) and a collection of guitars and other Classic Monster memorabilia owned by Metallica's lead guitarist Kirk Hammett (post-security in the Virgin America/ American Airlines terminal).
3. Kid's Play Areas
If you notice a lack of boisterous children while waiting to board your flight at SFO, it may be because the airport offers several innovate areas where kid can work off their wiggles. Find them post security in Terminals 2 and 3.
4. Hydration Stations
Every SFO terminal offers a tap that allows flyers to fill up their water bottles post-security without any of the icky-ness of a bathroom sink. This may seem like a small thing, but it saves thirsty travelers money and helps the planet.
5. Yoga room
There are two rooms in SFO where you can stretch yourself out before or after being shoe-horned into an airline seat. Both come complete with yoga mats and blocks as well as full length mirrors to help you check your pose. Find them in Terminals 2 and 3 after you clear security. Both are open 24 hours a day.