In Oxhey Park when my brother was 13 and I was 10 around 1939 we used to go down the dump and get a bike that someone had thrown away. My brother used to adjust it to suit his build then he would ride down the hill in his swimming trunks and drive straight in the River Colne.
In the winter time when it snowed more we used to get a piece of corrugated tin to use as a sledge and slide down the hill in the park.
We used to swim and go fishing and we would catch Cray Fish which we used to call Crawley Bobs. Then light a fire and cook them on a bit of old tin.