Teaching Swimming Lessons – If you’re a good swimmer you might be able to pick up a weekend swim teacher gig at your local recreation center. Keep in mind that some places may require a special certification or that you be a lifeguard.
Cleaning Houses – This is a job with flexible hours, but requires a bit of elbow grease. Some homes would provide their own cleaning supplies and tools.
Become a party DJ or help with a DJ company. The work isn’t too difficult and you can make decent money for a few hours work.
Teach English to Adults – Go through your local schools and colleges to find classes where teachers of English are needed.
Sell your photography and graphic design skills through Stock Expert, Elance and your own site. There is a large online demand for website templates and graphics as well as stock photos.
Sell your crafts and creative works such as art or jewelry through etsy.com, eBay, specialty websites and your own site. Create your items in your own home and market them online for extra income.
Baby-sit. Most of us have friends with children who would like to have a break every once in awhile. They would most likely rather have someone watch them that they know as opposed to someone they have to screen. Just let people know you’re available and charge a reasonable rate.
Drive People to the Airport – Another good hustle for someone with a reliable car and the ability to be on-time all the time. Once you have a few happy clients and word gets out, you’ll find you have to turn business away.
Sell Your Baked Goods – Are you skilled at a few special recipes? Contract your items out for parties, meetings, etc.