Free Things to Do in Central Tokyo 
Leave your purse in the hotel. It's a snap to have a blast in Central Tokyo without spending a penny. 
Senshu Bunko - Chat to  the friendly staff or curator and gain an insight into the   interesting collections  exhibited here. 
Bunkyo Civic Center - Architecture fans will no doubt love admiring the modern design of this local landmark. 
Hatoyama Hall - If you enjoy delving into history and heritage, this is one stop you ought to visit. 
Shimo-Kitazawa - Get acquainted with some of the locals and discover the hidden character and charm of this fascinating place. 
British Embassy - Well known among those who reside here, this site is worth stopping by. 
Yasukuni Shrine - Enjoy some quiet contemplation and discover a thing or two about this site's religious importance. 
Sotobori Park - Develop your green thumb and enjoy admiring the wide range of plants on display.