What do people expect me to do when they say:" Your a kid, go outside and play!" what does that mean? skip?

so i wanna be more active. im an 11 year old girl, and on yahoo i asked what i should do all day. most of my answers said: "your 11, you should be outside "playing". what do they mean "play"? how am i supposed to play? im alone, no friends, no sports, nothin. do they expect "play" to be to frolic and skip? give me some ideas of what to "play" so i can play outside more.