あなたは子供の時何して遊びましたか？って英語でなんて言うの？

All of these examples are asking a person what they liked doing as a kid. We can assume that what they were doing as a child was fun for them.

You could ask a general question about what someone did when they were a child but it is more common to ask about what games someone played. The question, "What did you play with?" means what toys did you play with.

"What are some fun things you did as a kid?" Things - This can include games, sports, hobbies, etc. You could ask about a specific thing by asking.... "Did you play soccer as a kid?" "Did you fly kites when you were a kid?" The possibilities are endless. "What did you enjoy doing in your free time as a kid?" Enjoy - like or have pleasure in doing. Free time - Time when you were not at school, doing homework, or other things. The time that was yours to do what you wanted.

To amuse yourself is to entertain yourself, and keep yourself occupied by doing fun games and activities.

To get up to (something) means to do something, but especially, something that others may disapprove of. To spend one's free time - this usually would be spending time on something enjoyable or that gives you gratification in some way. Eg."John spends his free time working in the charity shop to raise money for deprived children."

When talking about children you can also refer to them as a 'child' or 'kid' most children have fun playing games so to ask them what games they played with explains how they had fun, favourite childrens games always change

We can ask others about their childhood and what they enjoyed doing, the words 'for fun' point to free time, things that they enjoyed doing that made them happy. Children like to play with toys and use their imagination, kids also like to play outside in nature.