These are all the locations that are shown when Brandon and Emily wander around San Francisco in the season 4 episode "Emily"
Note: Refer to the Windows Live map to see a map with all of the locations marked and noted. These listed below are the few that are visible from Google Street Maps.
Carriage Ride: Google Maps Street View
Haight Ashbury Walk: Google Maps Street View
Park overlooking Ghirardelli Square: Google Maps Street View