Walk to Beijing Zoo.
Zoo-Forbidden City: Take Metro Line 4 at the zoo (in the direction of Tiangongyuan), change to Metro Line 1 at Xidan (in the direction of Sihui), and get off at Tiananmen East Station (exit A).
Forbidden City-Temple of Heaven:
Take 1 (or 2) and get off at No.3 Tiananmen East Station.
exchange
Take bus No.2 (or 120) and get off at Ximen Station of Tiantan.
East Gate of the Temple of Heaven-Happy Valley;
Walk to Beijing Gymnasium West Station.
12 station
Take bus No.41and get off at Houfengqiao South (beijing happy valley) Station.
650 meters
Walk to beijing happy valley.