the island

I'm at the island with the monkey in the boat. How do I clear the underbrush?

there's a machete type of thing in one of the coconut tree, use that to clear up the bushes

Where is the machete and I he other banana?

the machete is on the trunk of a tree in the background-click on it and take it to the underbrush on the left side of the screen-after the brush is cleared away you will find 3 reptiles, one banana and one sapphire