Here is the best part! I decided that I would bring only the Canon 5D Mark III and no flash. I figured that with the high ISO abilities of this camera, I didn't need a flash. Originally I was going to grab a 50mm 1.4 lens which is great for low light shooting, but since others had told me that that many of the street vendors did not like to have their photos taken, I decided to take my Tamron 28-300mm lens. It is far from ideal in low light, but an even better test for the Mark III.
There were two lessons learned during this mini photo session.
1. The Canon 5D Mark III handled low light shooting wonderfully and allowed me to capture really nice images in very low light. Honestly, if I had used a flash in this situation, I would have lost much of the ambiance of the scene.
2. Even though people might tell you that you will be unwelcome with certain people, with the right attitude and a big smile, you may get a much better reaction from those in front of the camera.