It varies , but mostly parties and we watch the New Years ball drop in New York either on tv or If your lucky in New York . Sometimes where i live people will fire fireworks or bang pots and pans obnoxiously. And decide what or resolutions will be. .
Get drunk, do things they regret, and party all night long...However, some people like to spend it with their families and have fun little family parties, which I think is better, and safer. Typically, people make what are called, "new years resolutions" where they want to use the new year to turn over a new leaf/start anew. The most common, and least followed through new years resolution is to go to the gym, eat better, and become healthy.