I would set up a social experiment in which I would take everyone's wallet and replace it with a Zip-lock bag. Everything in their wallet goes in the bag, it is just the wallet I'm taking. If there wasn’t enough time while I was taking an exam, I would stop time. I would also cheat on every test I would take. If I was about to have an accident I would stop time and save myself from getting injured. I would sleep for as long as I wanted to and generally just be lazy and do stuff I wanted to do by stopping time whenever I felt like it. 

I would do crazy things like walking above the vehicles during traffic jam. I would stop time at the  river and fish. I would also stop time and stop illegal activities whenever I came across them. I would buy some food from the shop or steal some food and give it to the poor. I would stop time when someone was going to fall from a building and save their lives. If the ink in my pen ran out  during examination I would stop time and run to home get more ink. The possibilities are simply endless.

To be honest, I'd probably be the biggest abuser of this power, and I’d use it in just about any way that could possibly benefit me. However, I would try not to do so at the expense of others. Whenever I felt especially magnanimous, I would also do things which would benefit mankind. After all, with great power comes great responsibility. Or so they say.