Using your fingers, not chopsticks, dip fish side down into plain soy sauce (not mixed with wasabi) to keep the rice from falling apart. The key is to taste the fresh fish and vinegar sushi rice, not a mouth full of wasabi. It is pre-seasoned into the sushi for a reason. Some of the world's best sushi chefs will scoff at you for asking for extra ginger, wasabi, soy sauce, or spicy mayo. Please, don't eat sushi like an ignorant American.
Tokyo street by night. Japan is the no. 1 nation in the use of vending machines, from which most are in operation 24/7. Most machines go into an energy saving mode during nighttime, but they're always open for business.