playground
play + ground
https://gyazo.com/d16eb1b92e5f78a15b4593b445a716b0
source: They Swinging GIF by Buta | Gfycat
noun
an outdoor area provided for children to play in, especially at a school or public park.
(学校・公園などの戸外の)遊び場, 遊園地; 運動場
a place where a particular group of people choose to enjoy themselves:
〖単数形で〗行楽地, 保養地.
e.g. the mountains are a playground for hang gliders.