You will be logging between 2-5 miles depending upon your training level. Here's a link to the course map for your reference-
Tuesday's Golden Gate Park Run
We will actually be launching from the top of the staircase that leads down to the ballfield and heading WEST on Martin Luther King. We will run along Martin Luther King for roughly a quarter of a mile before turning RIGHT onto Music Concourse Drive.
We will run along the sidewalk in front of the California Academy of Science and get a nice view of the Music Concourse and the DeYoung Museum. We will follow this sidewalk past the California Academy of Science as it heads towards JFK. The path will run directly into JFK. At this point turn RIGHT ONTO JFK. This is roughly 1/2 mile into our run.
Continue running on the right side of JFK on the sidewalk for roughly another 1/2 miles and you'll run into the intersection of JFK and MIDDLE DRIVE. This is right in front of the tennis courts. This is 1 mile from the start. Beginner runners will turn around here and head back to the ballfields for 2 MILES!
Everyone else will cross over to the LEFT side of JFK at this intersection and continue running towards Stanyan. You will eventually hit the intersection of JFK/Stanyan. This is a conspicuous, controlled intersection with 4 way stoplights. This is just over 1.25 miles into your run.
Cross Stanyan and cross over onto the panhandle which runs parallel to Oak/Fell street. Stay on the RIGHT side on the panhandle. As you are running along the 'Oak' side of the panhandle, pay attention to the cross streets.
Once you reach Oak and Cole Street you have logged 1.5 miles. Intermediate runners will turn around here and head back to the ballfields for 3 MILES!
Advanced and Race level runners will continue running along the 'Oak' side of the panhandle. Once you have reached Oak and Lyon Street, you have logged 2 miles. Advanced runners will turn around here and head back to the ballfields for 4 MILES!
Race level runners will continue running along the Oak side of the panhandle until Oak runs into Baker Street. This is effectively where the panhandle ends. Turn LEFT on Baker Street and then take another LEFT on Fell Street and continue running on the 'Fell' side of the panhandle.
You will run all the way to the intersection of Fell and Ashbury. This is 2.5 miles. Turn around here and head back to the ballfields for 5 MILES!