Christmas is the focus of most light displays at this time of year, but there are a few impressive shows whose focus is as much about nature as the holidays.
Brookside Gardens also brings a decidedly botanic and nature-loving twist to its impressive holiday celebration, the Garden of Lights. They're open now, every night through the end of the year except Christmas eve and Christmas, from 5:30 to 9pm. $20-25 per vehicle (but it's a walk-through display).
Zoo Lights opens this Friday (from 6-8:30pm), and each week it will highlight a different area of the zoo with animal themed light displays. They're open Friday through Sunday for the next couple of weeks, then most nights of the weeks before and after Christmas. Free (there's charge for parking even if you're a member).