How do I turn the headlights off on our 2005 Buick Century?

We have the most beautiful display of Christmas lights at our local park every year. They asked that we turn off our headlights when we’re driving through….but the Buick’s lights come on automatically and we don’t know of any way to turn them off. However, I was looking around and saw plenty of the newer cars—and they ALL have auto headlights anymore—and they had their lights off.

I looked in the owner’s manual and I Googled but I didn’t find anything.

Is there something obvious that we’re missing?