1) Take the Q or B train to the Prospect Park subway stop. Try to get there at around 6:30 pm. You can see the general location with this link:
2) When you exit the station turn right. Walk down Lincoln Road into Prospect Park. Once you are in the Park the Oriental Pavilion should be on your left. If you are lost just look for all the runners.
3) Sign up for the race by paying $5 and filling out a form. Cheap and easy. There is also a bag check.
4) Race starts at 7pm.
5) After the race we will all walk over to Lincoln Park Tavern together. Here is what yelp has to say about it: