No one knows your hometown like you do, and you can translate that into cash by leading tours of your city. The website vayable.com allows you to set up and guide tours around a particular cultural experience. If you’re the foremost expert on ghost stories, beer, architecture, or crime (or anything else!) in your town, then you can start leading tours for people who want to hear your stories.
Using the money you already have to make more money is usually a pretty smart move. A service like Lending Club is a great way to act as a lender and earn interest on your money. Essentially, you act as the bank, which is pretty neat. Lending Club is the world’s largest online credit marketplace connecting borrowers and investors. Definitely something worth looking into!
Mechanical Turk is Amazon's take on micro-jobs. These are small miniscule-jobs that you can do for other people, which they call HITs, or Human Intelligence Tasks. These are super simple tasks that anyone can do. Some examples are listing off some URLs with certain kinds of images for one cent, or recording a few phrases with a microphone for 6 cents.
Hold a yard sale. If you have a yard or garage and plenty of items to sell, you can have a yard sale as early as tomorrow. By advertising your sale on local Facebook pages and Craigslist, you can also skip the paid newspaper ad and keep all of the profits for yourself. If you don’t have time to price everything, try asking patrons to “make an offer” or grouping similar items on tables with an advertised price (e.g. everything on this table is $5).
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
Double check yourself, before you double wreck yourself. Make sure everything you send to a company, whether a résumé, an email or a portfolio, is good to go. Double check your grammar and wording, and for God’s sake use spell check! This is especially important when it comes to the company’s name. Don’t spell their name wrong and be sure to type it how they type it (e.g. Problogger, not Pro Blogger).
Buy bottled water in bulk at Costco or Sam's Club and sell it for a dollar where there are a ton of people: parks, festivals, concerts, etc. People are crazy for bottled water and this is a little summertime gig that can bring in more money than you'd think on a hot sunny afternoon. Here's a bonus tip: give some of your proceeds to a charity you care about or that you know will resonate with people. In doing so, you're bottled water business isn't all about your profit. You're helping better our world and also provide a thirsty person some water to drink.
Join a startup accelerator: Another great option is to apply to a startup accelerator like Y Combinator, 500 startups, or TechStars, where a group of investors will help coach you, connect you with potential partners, and provide startup cash in return for a small stake in your company. The competition is tough to get into these, so don’t rely on them as your only path forward.