Fun to do and location is close to Silicon Valley! However, as with any other hot air balloon rides - subject to weather conditions for safety. Please call first but they are open 7-days a week.
I would recommend calling before you go. I drove to the airport (where it says it's located on the map), and I didn't find the venue. It was a holiday weekend on a Saturday and there were no hot air balloons in the air. Definitely do research to see if it is still in business.