I agree with the poster that if your villagers are harvesting only coconuts, then your food supply won't stay up. I have been lucky that one of my villagers hates coconuts and stays only in the crops. But the other two are obsessed with getting the nuts off the trees and I have to micro manage them allowing only one to harvest the nuts at a time. This way I can get rid of the coconuts once and for all and still keep my food supply adaquate.