Fast food restaurant (food), advanced water bar (drinks), children's playhouse, interesting science and technology museum, gym, dance training center like KFC (fun). If you want to sell small things, it depends on the season. In short, it is to make something with selling points, characteristics, marketable, high quality and good price. It is necessary to examine the market (such as demand, competition, etc. ) and learn from experience. There are tricks to do big and small, and slow and steady. I wish you a fortune ~