Hiding/building farms in survival

I'm one of, what I assume many others are, a sufferer of constantly restarting worlds. I typically start a world, build a starter home, workshop, make things look nice and beautiful to hang around. Then move forward with diamond hunting and build my first farm, usually a cow farm for food supply and leather to get my enchanting setup. After this I find myself stuck wishing I would have better planned my base area and get lost at where I should build my other farms without them sticking out like a sore thumb.

How do others do it? Do you build multiple building for each farm, build them underground, or build one giant base that houses most, if not, all of their farms.