Haha, same here, but ours were packed dirt trails with dirt and wood ramps in the woods (our neighborhood had a large forested area nearby). Fun stuff, and definitely some very fond memories.

But, I was definitely one of the kids that broke their leg (my femur) and had to get 4 steel pins that stuck out of my skin to set the bone while it healed for about 3 months before getting a regular cast for the rest of the healing. It was pure agony, the entire healing and physical rehab recovery process took almost a year (my school even sent an in-home tutor to my house for a couple of hours a day since I had to stay at home for several months). I'd never want anyone to go through that, particularly my kids.

That being said, I do think it's important for kids to have a degree of privacy and autonomy, I just don't think I'd be kosher with the amount of unsupervised freedom that I had as a kid (my kids are still <5, so I have some time before they're semi-free range animals).