I'm going to New York this weekend for a c-teen event(Jewish organization). And we are going on a yacht on Saturday night. It's taking us around the city. I want to take photo of the city. But i have no clue how to do that at night. I have a canon t3 and canon 40D, with a 70mm lens. Can u guys help me? What setting should i use? Should i use a flash? I don't know flash that well, but i can give it a try.