The Jungle Rapids serve as the first A-Grav Zoomer exclusive route in Jak and Daxter: The Precursor Legacy VII. The starting path is at the top of the waterfall in the north area of Sandover Village, at the top of the cliffs. From there, you'll walk through a short tunnel to the zoomer. Jak and Daxter will have to pilot the zoomer down the rapid river, but they can't take too much damage from the rocks and tree trunks on the way there or they'll have to start again. Green Eco serves the same purpose for healing as it does on foot, so make use of any that you come across. There are of course a few sharp drops from waterfalls on the way, so be careful. After a perilous journey, the zoomer will come to a landing in a watery basin at Rock Village, along with a Power Cell reward.
The route is one-way, so you'll have to activate the teleportation gate in the Red Sage's lab in order to return to Sandover Village if you ever want to go back.