My two boys (8 and 10) and I went on a Saturday morning - and we had a blast! The zips are incremented from easy (short, not too tall) to awesome. My older son is a bit scared of heights, but the guides, along with the incremental heights and lengths, made it an extremely fun experience for him.
Gonzo from Team 2 was hilarious with a dry wit sprinkled with a few jokes for the kids. The two others on the team were also great with kids, funny and clearly well-trained on safety.
The pictures they took allowed us to be 'phone free' for the 2 hours, which is how we like to do our vacations. All of the photos (about 20 or 30) were for sale at a very reasonable price. We bought them and tipped our guides $20. (I've attached one of the photos to give you an idea of the quality).
The museum, particularly the P51, was cool for us in the morning as we were the first ones there.
Thanks for the zips - we will be back if we get back to Maui one day!