Pass the second hippo in the Hippo Lagoon, there's a pole there, climb it and you find your self in the vine area but if you target behind yourself you'll see a climbing spot and BAM you're in the area to choose to go up to the tree house of the tree top ... it skips the vines after you get all the chests.

Be warned, if you fall off the hippos, you have to get back to the first one and do it all over again so be patient before zipping off of them or it sucks!