Mostly playing football in the street or down Sevenoaks, or playing runout / mob around Grangetown. Playing basketball in grange gardens (low rim you could dunk) or the Marl for the full size hops.
In the summer we would jump off Boseys (not sure of spelling) down channel view into the mouth of the Taff. There are apartments there now. Or we'd jump off the black railway bridge we called Soapys, into the river Ely. Used to go to Splash in the empire pool, and fly off the top board. I dived off fourth board, but only jumped off top.
Riding bikes up to Castle Coch on the taff trail, and jumping in the taff at blackweir on the way.
Conkers, marbles, pogs, swapping stickers. We would graffiti with hair dye spray, that would usually wash off when it rained. Although the black spray would last a bit longer.
Good times.