15. Tour Guide

Whether you travel a lot or know your town like the back of your hand, working as a tour guide can be both refreshing and a great way to earn an annual average of $30,489, according to PayScale.

You can either escort national and international tours in addition to working by the tour or the day, depending on your flexibility and how much traffic a certain area gets.

16. Substitute Teacher/Aide

Depending on where you live, you may not need certification in order to work as a substitute teacher, though certification is required for full-time positions. You have to note your availability for a school or for a specific region and then wait for a call.

On average, substitute teachers earn an annual $28,003, according to Glassdoor.

17. Test Proctor

If you have basic computer and customer skills as well as a flexible schedule, you could work as a test proctor. These individuals are needed for certification, licensing, college, and graduate school testing among other standardized exams.

For $12 per hour, this job could definitely help supplement your income.