Amazingly huge. There's a train on wheels (310yen) that will drop off the visitors in 5 different stops. In spring the 3rd stop is the best for flower garden and cherry blossom viewing. There's a biking area, boating and swimming on summer. Entrance fee is required . Come early to enjoy a long walk... I came out of Tachikawa station but can't find where the store I was looking for...someone told me they don't know where it was but she and her friends are meeting up to go to a huge park she hasn't been to... that's when I decided to follow any group with bento food ...that led me to this discovery. I love it!,