With my parents and sister in town, having a few more people at our house gave us a built-in excuse to buy champagne and noisemakers and sparkling cider. We made a ton of food and celebrated with fancy crackers/poppers/whatever you call those things you pull apart with a bang that have a toy and a crown and a cheesy joke inside of them. Brigid wore a tiara, because you should always welcome in the new year in something sparkly.
And then my family decided that if everyone else in the vicinity was going to set off fireworks and shotguns and who knows what else was making all of that racket at 12:30am on New Year's Day, they were going to shoot the bb gun into the ground off of the back porch. So they did.