I built a space rocket for my 3yo during the lockdown. Complete with acrylic windows, command panel, and a place to sit. It was very simple, and at some point, we added an old joystick, but he played with it so much that it is a bit destroyed by now. Still, when he wants to be alone, he goes inside and closes the door and just sits there pretending to be an astronaut.
A large adequately folded box-sled has enough structural integrity to run a rope through a hole on one end and be pulled by an ATV through the grass at high velocity. This experience is enhanced by applying centripetal force to the sled and slingshot the rider through a large pile of leaves. then wait till he ends up ruining it and then convince.
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