For anyone with only one day to travel to Kakadu, this bus tour is an absolute MUST. The natural wonders of this awe-inspiring part of the Top End are amazing - something that all Australians and visitors should experience if they have the chance, I would also highly recommend the optional flight over Arnhem Land - seeing this vast ancient land from the air is a real privilege and gives another perspective on the vast size of Kakadu. Booking through Viator was easy and professionally-managed and the organisation and service on the tour was excellent. I don't normally do organised bus tours, but I was very impressed with every part of this day's itinerary. The Yellow Waters cruise was fantastic for seeing huge crocodiles up close, plus dozens of varieties of birds. There was also time for an easy bush walk in the Nourlangie Rock area with the added wonder of seeing aboriginal cave paintings. The tour finished with drinks and nibbles overlooking the wetlands outside Darwin and a magnificent Top End sunset.