11 or 12. I don't hit driver on the 4 par 3s, obviously. I don't hit driver on the 1st, which is a utility/short iron, unless into the wind. I don't hit it on the 11th, which is by some distance the worst hole on the course, because the fairway is only about 10 yards wide at driving distance and a miss right is a lost ball. I play that hole with two utilities, frequently. On a still day or with an easterly, I don't hit driver on 17, unless I'm driving it really well, in which case I may go over the corner of the dog-leg. In the prevailing westerly I will hit driver, though.
All this tells me that I'm not long, that the course, or its maintenance is flawed (11 is just a dreadful hole, if they maintained the rough short right of the 1st green I might do what the flat bellies do and hit driver over the corner, risking a half wedge to a shallow green (from that angle) with serious hazards (deep bunker or racetrack rough) for a failure to control the ball out of short rough. It also reinforces that the modern driver is likely to fly as straight as any other long club in my bag.