I'm not exactly young anymore and things have sure changed a lot since I learned my way around a computer. But here are the things I remember being fun for me back then:
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Drawing around in paint (you already have that covered)
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Creating presentations. Maybe like: Make a presentation about your favourite topic. This might involve collecting pictures either from the internet or getting them from a camera / phone on the laptop.
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Playing some games (in my case pinball, but that's definitely not very up to date). You can learn quite a bit about clicking through menus etc from playing games.
Something else that would be important to learn early is created folders and keeping some sort of system with your files. I struggle to come up with a fun way to teach that though. Maybe someone else has a good idea?
They are if you don't make them obese.