Our 13 year old loved this activity as much as we did. What made this the zip line experience we chose was the location - we wanted to zip through a jungle like atmosphere rather than across dry open terrain, and that's what we got. Even crossing the suspension bridges between the zip lines and climbing the super steep ladders up in the trees to access the zip lines was fun. The staff are all wonderful and do their best to make everyone feel comfortable. They are really good with kids. It was about an hour and a half experience for our group and not inexpensive, but if you've never done it, I would recommend this outfit for a first experience.
We also liked the location being near Haiku as it took us across the island from where we were staying. This would make a nice day combining it with a tour of Haiku Mill (only offer tours Tues, Wed and Thursday as I write this so need to check and coordinate) to see the botanical gardens or visits to Surfing Goat Dairy or the Lavender Farm, both not far south. While you're in the area, across from Haiku Mill is the Haiku House (private luxury resort accommodations) and worth a slow drive past to enjoy the view. Northshore Zipline is also close to Mama's Fish House and could round out your evening.