Hello Ming,
Thanks for sharing your experience with us. It is really important for us as it helps us improve to give our passengers great trips.
We are really glad to know our guides were up to your expectations and were helpful. We hope they gave you memorable moments gathering their knowledge and the beauty of our falls.
As you commented, the price for a tour involves several processes (planning, booking, operational, administrative) and managing services altogether. Taking a tour already set up gives you the benefit of avoiding all these processes; which can be difficult and risky if you are not familiarized with the destination.
Regarding our documentation request, we always ask for this kind of information from our passengers and they usually sent it directly to us, as we are who process the bookings. However, we apologize for asking for this when you had already sent it to Viator. We were not aware of that. We will have it into consideration in the future.
We hope you had enjoy our Falls and our people.
Looking forward to receiving you again in Argentina!
Kind Regards
Ayelen