Water flow peaks in the rainy season (May to August), which creates the most dramatic curtains of mist and spray - unforgettable for photos but expect dense crowds. December to February is hotter and drier, with less water but clearer skies and fewer tourists. Check weather patterns closer to your dates since rainfall varies year to year.

The 3-5 day packages that include flights and accommodations tend to fill weeks in advance, especially around holidays and peak season. If you're flexible on dates, booking a month out gives you solid options; during high season, aim for 6-8 weeks. Single-day activities and short lodge stays can sometimes be booked closer to the date, but don't count on it.

You can walk the national park trails solo, but a guide adds real value - they know where the light hits best, which trails avoid crowds, and what wildlife you're actually seeing. Most visitors book guided excursions as part of their package anyway, whether jungle walks or boat rides. If you go independent, pick up a map at the visitor center before you start.

Many tours bundle all three - Argentine trails, the Brazilian overlook, and an aerial run - and it does give you the falls from every angle. The helicopter is pricey but genuinely special; the Brazilian side offers a wider panoramic view that the Argentine side alone doesn't give you. It depends on your budget and how much time you have, but plenty of people find a 2-3 day itinerary that mixes at least two of these sufficient.

A night or two at a rainforest lodge like Yacutinga shifts the trip from 'see the falls' to 'experience the ecosystem' - you get night sounds, bird calls, humid air between your skin and the canopy. It's especially worthwhile if you're already flying down from Buenos Aires; you might as well spend 4-5 days rather than a rushed 2-3. Check what's included with your package since some lodge experiences bundle meals and guides.

Most multi-day packages cover flights from Buenos Aires, hotel or lodge accommodation, at least one guided tour of the falls (often more), and sometimes meals. Some add the boat excursion, Brazilian side access, or helicopter flights; others don't. Always confirm what's included before booking - specifics vary widely between operators.

The national park has paved walkways and railings along the main trails, so many areas are manageable, though some paths involve stairs and uneven terrain. Check before you go about which specific trails are passable for your situation. Families with kids typically book guided tours since the guides can suggest the best pace and stops for younger travelers.