I have a stay-upperer too. We let her have a dim lamp on (warm coloured bulb only as the daylight colour ones have too much blue light that promotes wakefulness). She is allowed to read or even play quietly but she has to stay in bed. For Christmas one year we bought her a little stereo, and we rotate through audio books. There are some great ones that are collections of short kids stories (like men fox, Aussie nibbles, etc) and we are constantly finding good ones at the library too. She is happy enough to lie there and listen to a few stories or even look at pictures in her books.

Our other trick is that 6 o'clock is sit down o'clock meaning all activities after that time need to be sedentary. It helps get her more settled before bed.