Toshimaen Sakura Nights 2015
Time Out says
Combine a fun day at the amusement park with some after-hours hanami at the charmingly old-fashioned Toshimaen, which boasts a total of 500 cherry trees on its spacious grounds. Head over after 3pm and get half off the park entrance price (standard entrance ¥1,000), and take the chance to ride the rollercoasters at a reduced rate with the night-time 'Illumi-Night Pass'. The area will be lit up after sunset every day between March 21 and April 5.