Unless you're boondocking, try plugging a small nightlight into the outlet over the side counter and one in the bathroom. Turn it on when you go out and anyone coming in should have plenty of light to find the head (if that's all they're coming in for). There's also the light switch on the first stair riser for the ceiling light over the door, tell them where it is. Unless you've got that barrel cabinet under the counter, you can mount a night light in that outlet, as well.
My only complaint about the switches in the cabinet is that there aren't enough. I'd like to be able to select the ceiling lights singly, rather than in pairs.