What do I need to cross the border at Niagara Falls?

Yes, you need a valid passport or an enhanced driver's license (if you're a U.S. citizen) to cross either the Rainbow Bridge or the Whirlpool Bridge. No exceptions. If you're flying in, a passport is mandatory. For kids under 16, a birth certificate works for land crossings, but bring the passport to avoid hassle. Expect delays—weekends and summer afternoons can hit 30-60 minutes, especially at the Rainbow Bridge. The Whirlpool Bridge is faster but only open to Nexus cardholders and certain hours, so don't bank on it unless you have the card.

If you're driving, make sure your car insurance and registration are up to date—Canadian border guards can ask for them. Also, declare any alcohol or tobacco (over 1.5 liters of wine or 200 cigarettes triggers duty). Don't try to bring in weed, even if it's legal in your state; it's illegal to cross the border with it. Pro tip: Use the "CBP ROAM" app for U.S. re-entry to skip some wait times. Otherwise, bring snacks and patience.