Just me and my son for many New Years Eve's and no matter his age we may go to a party at a friends ,or staying in we have had various ways to enjoy the evening and make it special: mini chocolate fondue (was in his stocking one year), hootananny, watch new year coming in all evening around the world, mini bonfire and marshmallows, dancing in the kitchen and make pretend mulled cider, takeaway, film, blessing the house (basically waving an incense stick in every room and asking the house to keep us safe and warm for the following year)
Just lighthearted bits of fun.