Get there at least 30 minutes before sunset and leave in time, it is a bit of a drive to get here from the rest of Arcadia.
There is a footpath at the south end of the parking lot. Follow it and get down on the rocks past the staircase.
You will have to do some scambling over rocks to get to the best spot. Get down close to the surf and walk up until you are just a hundred feet south of the Light.
See my attached photo.
If you are lucky and it is foggy, the red light makes some really cool raybeams!