I fucking love Lego, I had loads as a kid. A huge big bag of it and be lost for hours with it.
Scalextric too, not on this scale but still loads of fun.
My first 'computer'. Memories of spending hours and hours typing in a program and nothing happening, waiting 20 mins for a game to load from cassette and then an error.
Other ones on here bring back memories, Evel Kneivel wind up bike thing, Hot Wheels etc. All good fun.