The whole journey takes about 34 minutes /6.4km/5 stops/1 transfer.
The starting point is Renmin University. Take Metro Line 4 and get off at the East Gate of Peking University after 3 stops.
Walk about 290 meters from Exit A to Zhongguancun North Station. Take bus 438 (or bus 628) and get off at the west exit of Tsinghua East Road after 2 stops.
Walk to the playground in Tsinghua University North District.