If you want some really long zip lines along with optional tarzan swing, rope-drop, and a climb through a huge strangler ficus, there are plenty of options in Monte Verde. In fact, there are slightly longer ziplines to be had at other places. The Original Canopy Tour stands out because their zip lines are ACTUALLY IN THE TREE CANOPY!!!
It's amazing, you zip from tree to tree via huge platforms that are nestled in the tree canopy which gives you a completely new view of the cloud forest. The zip lines get your adrenal pumping but also provide beautiful views of the surrounding area. In addition, the tour guides are friendly, fun, and have a big focus on safety. Each one also spoke flawless English, so there was never any confusion about how to stay safe.
Last thing to mention, we had a FANTASTIC group on our tour. The age ranged from 20s to 60s, and everyone did just fine. We even had someone who is afraid of heights but they were in good hands with the tour guides, and finished every piece of the tour.
All in all, this is THE zip line tour to do in Costa Rica!