Have you spent 20, 30, 90 minutes driving to a Point Reyes beach only to be sand blasted by huge gusts of winds? I have. Many times. That’s why I stick a kite in the car. Flying a kite is at once peaceful and fun. You can help but smile while flying a kite. I suggest bringing a durable kite since the winds can be very strong.
If you are actually go specifically to fly a kite, but it is not a particularly windy date, your best bet will probably be the oceanside beaches (North and South Beaches are the easiest to get to).