LOL, no it's not Crissy field. I had to look it up (and I'm a native San Franciscan and have lived here all my life) - It's Lafayette Park. It's not fenced, but it is an elevated park with picnic facilities and, like I said, a HUGE dog run and dogs are allowed off-leash there, in fact I think it's encouraged. I love watching the dogs play with each other in that park. I'll see if I can find out anything about making reservations for an event.