I really didn't think I was going to like this, but it was super fun. My husband had to talk me into it and I think I ended up enjoying it more than he did!
Motion sickness wasn't my friend on this fast jet boat. Doing 360s just made my head throb. Was a cool river valley. NZ is paradise. A dream fulfilled to ski in summer.
If you are heading from Arenal/La Fortuna to Monteverde, you can take boat taxis across the lake. This is a faster alternative to circumnavigating the lake on land.