Meaning: This sentence describes a situation where children engaged in an activity for enjoyment or recreation in a public area with a feeling of happiness or contentment.
Choice of Words: "Kids" is a term for children. "Played" is the past tense of "play", which means to engage in an activity for enjoyment or recreation. "Park" is a public area with trees, grass, and often playground equipment. "Happily" means in a contented or joyful manner.