The reflections in the lake in the Japanese Garden were awe-inspiring - absolutely beautiful. We also enjoyed the Gingko Avenue and just walking around the park.
One suggestion is to have more obvious signage after the Nishi-Tachikawa entrance. It was not obvious where to go or how long it would take to get there.
We do wish that the park was open until 9:30pm as by the time we got there after work (travelling over an hour), and walked to the Japanese Garden, it was almost closing time.
We are VERY happy that we did go and highly recommend it to others.