One of the best places to view Sakura Cherry Blossoms in Tokyo at night time is at Chidorigafuchi Moat around the grounds of the Tokyo Imperial Palace. This spot is a famous spot to view Cherry Blossoms during the day, and at night time they are lit up by huge spot lights, with the Cherry Blossom trees on either side of the water.
Cherry Blossom season in Tokyo is usually around the last week of March and first week of April, all depending on the season. The Cherry Blossom season only goes for 2 weeks with the flowers quickly falling off the tree after full bloom.
The best vantage point to look directly down the moat, with the cherry blossom trees down each side of the moat, has a queue with loads of people waiting to take pictures. This queue at night time will often be close to 1 hour wait to get to the front to get your picture. I did not queue up to get that classic pic of the Cherry blossom hanging down over the water.
There is also a walkway that travels down the side of the moat which has plenty of great vantage spots to get pictures of the cherry blossom trees with many people on the moat in rowing boats.
When it comes to Cherry Blossom viewing, take pictures, do not take the flowers. Cherry Blossom season has great cultural significance in Japan. As well as providing great beauty to the Japanese landscape, the Cherry Blossom season marks the end of winter. Not just a thing of beauty, as the Cherry Blossom season is very short, just 2 weeks before the flowers drop off the trees, the Cherry Blossoms should be enjoyed in their natural state, not ripped off the tree to be taken back to your hotel as a souvenir!
To get to Chidorigafuchi Moat, the closest subway station is Kudanshita Station.
After viewing the Cherry Blossoms at Chidorigafuchi Moat, then head directly across the road to Yasukini Shrine. During Cherry Blossom season there is a food night market with many stalls selling Japanese food like Okonomiyaki, Yakitori, Takoyaki, Grilled Octopus on a stick, grilled river fish on a stick and loads of stalls selling beer and hot sake.
The food night market at Yasukini Shrine closed down for a few years for health regulation but they opened back up in 2019 and hopefully will stay for the coming years. You get get some delicious plates of food starting from around 600 yen.
See the location of Chidorigafuchi Moat in Tokyo