About 30 feet above the ground was my limit as a tree-climbing fool kid. I and my young cousin would climb a lot because we had lots of great trees. We would hang like monkeys and do stupid risk taking. We never were seriously injured. A benefit from all this was good physical conditioning.
Oh that would have been so much fun, we too had lots of trees and I used to gang up with the boys and climb....it was so much fun....then one fine day...I was admonished....no more...no more;((