Okay, I lied when I said our backyard was nothing but weeds...

It's also full of big red ants, and gopher holes. I'd like to plant some veggies back there, but if the gophers are going to take everything, what's the point?
And I don't want to trap or poison them, any natural suggestions? Anything tried & true???
And how do I tell if we have fire ants? I'm going to try putting out a Borax/sugar mix for them, will it work? They have holes all over our yard...