If I had to choose between this and Marble Mountains, I'd go for this. The way to get there is very nice and you can see beautiful landscapes while from the top on the sunny day you can see whole city.
Brazilian Atlantic Forest is very green, green and basically shades of green, but it's amazing and you will see many hilla covered in green, the best and easiest way to experience this scenery is doint the "Serra Do Mar Train Ride" that departa from Cuririba (capital city of the Paraná State) and ends at the Morretes Historic City! Make sure to eat the most typical Paranaense food, Barreado!