There are lots of things to do. Lots of programming things mixed with other domains like music. Just one example: https://sonic-pi.net/tutorial.html There are tones of SBC, plus arduino. Calliope and others. Scratch for little kids, lego mindstorms. I know boys between 11 and 13 learning Python, programming some simple games. There are also lots of robots and HW. What there is not (or I do not know it) is something like the microcomputer of the 80s. That is a little computer which can do graphics, sound, little games, and even control peripherals with a very simple language. I would really have something like that.