We went back the a really cook park called Showa Kinen Koen. The entrance we used was right across a walkway from the Nishi-Tachikawa station. We had a blast, but I must say it wasn't as pretty as it was the first time we went. The first time was in April during a flower festival. The original post I did is here.
It was quite warm this last time. We had the bouncy clouds to ourselves for the first 20 minutes or so, but a school group showed up after a while. You can't wear your shoes, or take cameras on the clouds.
Rainbow hammock area is a series of interconnected nets. They seem similar to the nets that the trapeeze artists fall into. Unfortunately, adults are forbidden from dancing upon these brightly coloured strings. You can't claim you can't read the signs either... it's in pictograms.