We are a Japanese family living in singapore. Our 2 1/2 years old son and I are making a trip back to Tokyo on sept 22 and staying for 2 weeks.

Having lived abroad for many years, we don't have friends in Japan. I am looking for places where I can take my son few hours a day, a place where he can play with other kids of his age (like playgroup, playground, etc) during our short stay.

Is there any playgroup we can join for only few weeks, even if that means we have to pay.

You might want to try the Jidokaikan in Shibuya. Check out their website at: http://www.jidokaikan.metro.tokyo.jp/English/index.html