For NYC day trips, plan your route in advance and prioritize must-see spots to make the most of your time. Wear comfortable shoes, as you'll likely walk a lot, and check the weather forecast. Carry a water bottle, portable phone charger, and a MetroCard for subway travel. Avoid peak commute hours for smoother transit. Always stay aware of your surroundings, especially in crowded areas, and have a backup plan in case of delays or changes.