Accrobranch
The insurance companies have probably killed off this activity in the US. The idea is to scamper around from tree to tree using ziplines, tightropes and other devices. You wear a climbing harness that is always connected to a lifeline. The highlight was a 150 meter zipline that sent us whizzing over the treetops 15 meters above the ground. The next step is via ferrata, which is mountain climbing but with a permanently installed lifeline. We'll wait until next year to try that.