If your thin wallet has prevented you from going out on Saturday night, put your guitar playing talent to good use as an evening entertainer. In addition to nightly fees and tips (which vary by city), most restaurants and bars will pick up your food and bar tab for the evening [source: Stroud]. If the bar scene isn't for you, you could teach guitar lessons. Look into teaching after-school group classes or private lessons at your home. Put up flyers in local music stores, bars, restaurants and on community boards at schools, and make your rates competitive. You don't want to price yourself out of the market.