Just two hours driving from Nafplio through the mountains of Arcadia you can find one of the most beautiful rivers in Greece, River Lousios, ideal for rafting throughout the year. 
Lush vegetation, small waterfalls, arched bridges, canyons and birds are just a few of what one can admire in the two-hour trip on the inflatable boat.
On the arrival at the end point enjoy a one-hour hike through dense vegetation, ending up to a wonderful waterfall.