My girlfriend and I spent all day in Iguazu National Park--an amazing place, but totally packed with crazed tourists. We decided to have lunch at the Ipe Grill inside the Mandarin Oriental--and what a great decision that was. The setting was gorgeous, and very peaceful--an excellent getaway from the hectic park. The food was excellent as well: A hamburger with carmelized onions and fries. And the service, as expected, was impeccable.
We ordered off the bar menu, which made it much more affordable (Hamburger was still about $21USD). The main menu was closer to $30-45 per entree.