But you still get to make them yourself, too. If free will is synonymous only with unpredictability, than you'd necessarily have to make some choices that you don't want to in order to demonstrate free will, and that doesn't really make sense to me.
But if it's a certainty, with perfect information, then there's no choice to be had. The choice is an illusion.
Without the concept of free will you would have to assume that the cause for the event is originating from something else (a calculation of sorts based on previous states of the universe is a commonly stated alternative).
Free will walks the line of being a physics-based process which is neither to easily deterministic such as stone being heated in the sun or too random such as a radioactive element emitting a radioactive decay at a random/statistical time but still localizes the cause for an event in some assemblage of atoms such as a living being.