When I was a kid, I had a tree in my backyard that I visited a lot. I loved to climb it and go as high as I could. It was a strong tree, not that old, but it may have been there longer than the house which was about 15 years old. I don't really know the history of the tree, but it was there when we moved into that house, and it was well established.
I could get 15 to 20 feet up into it and be hidden by its leaves and branches. It was a great place to sit and think and enjoy nature. That's my history of hanging out in my favorite tree which was significant to me. :)
Sounds like you had a lot of fun :) I've never been a tree climber myself, but I enjoyed playing around the tall ones when I was in primary school.