Now that you know the circuit, start unplugging the power supply's of the equipment listed on that circuit until you find the draw. I'd start with the radio or similar devices first before the lights.

 

I'd start with the lights. Their easy as they really can only drain if they're lit. Glove box/console box I've heard are common and easy to miss. However, just a console bulb or glove box bulb should take days to drain without running the car. They don't draw a lot of power.