In fact, entertainment and fun should be put together. Since we mentioned "travel" for the fun part, let's talk about local activities for the entertainment. Most people here are students, and schools have a lot of complete facilities that are very convenient. The gym, tennis courts, and various sports facilities are generally free. I suggest everyone make full use of them, because it won't be as easy to find free facilities after you leave school.
When going out, there should be places everywhere to play billiards, bowling, golf, etc. Among these, billiards is definitely the cheapest. Some bars have coin-operated tables for about $1 per game, while dedicated billiards places charge by time, but it's not too expensive. Bowling is relatively more expensive, but with an AA system, it's completely affordable.