Hi Michelle, we are meeting at Rideout Fountain, which is in front of the bandshell. The address for the bandshell is listed is John F. Kennedy Dr and Hagiwara Tea Garden Drive
San Francisco, 94118
If you are looking for an easy way to get directions, you could use the address for the de Young Museum (50 Hagiwara Tea Garden Dr). The fountain is in the open area between the front of the de Young and California Academy of Science.
As a heads up, there might be a concert in the area so expect parking to be sparse. If you are parking on the streets, remove everything since the break-ins in the area are through the roof.