Zip lines are SO much fun. (Interesting fact, my hubby is actually qualified to build them and has done so before!) I used to work at a camp that had a 750 foot triple zip line and you could go down with two other people at the same time. It was TONS of fun. I also really enjoy camping, hiking, and horseback riding. It sounds like you are going to have an amazing vacation!!

Wish I could go, lol!
I attached a picture of the very bottom of the zip line, but you can go here to see more:
Doe River Gorge