3 places to go:-
Ancol - between the roller coaster and the sea
Bogor - Beats me where, let me know if you find it
Cinere - From the ring road, go south on Fatmawati till the traffic light, turn right and keep on the road until you get to a T junction. Turn left, and then first left again into a complex. Left then right and then straight until you get there.
Just about every weekend there is a race.