We had three terrific (enthusiastic, friendly, skilled) guides who managed to get us (2 adults and 2 children) and the rest of the group safety through the zip lines, while at the same time using our i-phone to take numerous great photos and movies of each of us -- no extra charge! The tour included two optional "activities" -- Tarzan swing and repelling-off-tree/climbing back up through hollow tree. We all did both, which added to the overall experience. The zip lines were fun -- started easy and worked up to longest two at end. Our children road all but last two solo, but also enjoyed going with the fun guides (one of whom took a movie of our son during their ride together!). Husband and son also did Sky Trek zip lines in Arenal...enjoyed these for their "thrill level" (focus there is really speed and length), but found the Original Canopy Tour of Monteverde to be better overall, due to great guides, being in the forest (hiking from area to area) and zip-lining through the forest, and the fun extra activites.