Photowalks is the perfect exercise to go and shoot street photography; being with a group of people that is shooting randomly will make you feel more comfortable when approaching strangers, and you will be able to get closer to the subjects.
The other interesting thing is that you will meet new photographers and you will learn from them, try to interact with them, pay attention to what they do, what setting they use in their cameras, what they do to approach random people in the street, you will learn tons of new things.
Here some photos of a Photo walk in Panama City. Fist in black and white and then Color, tell me which ones you like more:
And now some pictures in color: