Living on a farm our gang was just really the 2 of us but we did all the usual nonsense. Including climbing trees and jumping from tree to tree. I remember the year we had to clear a local barn for other uses and we moved all the old dusty bale (square type) and made a kind of fort out of them and then burst some so we could climb up into the rafters of the other barn and jump into the burst bales. It was quite a height as I remember.
This and loads of other stuff. We had skateboards and enjoyed street skating around our local village. We always had bikes and I remember the jumps we made. My mates dad had bricks around the place as they were building onto the house and I remeber the only factor that limited us was the length of the wooden boards we could find at the time. I seem to remember that we did get a long board once and got up to several bricks high. My mate and I were quite good at the jumps as we used to do it all the time but it was a laugh when you invited the local lads down to jump who all thought they were dead hard. Soon sorted the men from the boys. I dont think we ever had a serious spill ever. We left that up to the locals.