I was thinking Tinker Toys, Lincoln Logs, erector sets...
i’m 78....we had all three...electric train....those foot pedal cars...but bike was much better...roller skates with key of course.
I always liked those Kenner construction sets with the red plastic columns and beams that snapped together to make HO-scale buildings and bridges and such. I had several sets of increasing complexity.
The plastic bits didn’t break easily, either, which was handy when Godzilla came to visit.
I loved my microscope kit. I would find dead insects and make a slide of their wings. Silly Putty. Slinky. Colorforms. Paper dolls. LEGO. Baby Alive. A good old fashioned dollhouse. Cap guns. On and on.
Tonka Trucks - hands down.
I had one of these...
I’d have to give it to Erector Sets.....I remember hours and hours of fun as a boy with them.