I love love love the nightlight I got from
Amazon. Not sure how to link here but it is called AUVON Rechargeable Mini Motion Sensor Night Light (pack of 2).
Has 2 brightness levels, magnetic back so I stick it on the back of the bathroom door, on/off/motion sensor modes. I charge it before vacation and have never had to recharge it during a trip. Can also just use it standing up if there is not a magnetized surface nearby.
I bought it for cruising but now I bring it on every vacation.
ETA: I set a reminder for debarkation morning so I remember to pack it!