It was kind of chilly and there was a chance of rain when we visited this park in the Nagasaki Prefecture, but it was a weekend and the park was empty! According pictures on the map in the park, it will be beautiful come spring when all of the flowers covering the hillside are in bloom. In the summer, I imagine this is the place to be! That yellow thing is a water gun that you can use to shoot the targets ahead. It wasn't working the day we were there.
A climbing wall.
It's kind of hard to see from this angle, but there is a rollerslide and an obstacle/climbing course.