The beautiful and high waterfall Háifoss is one of the hidden secrets of South Iceland. It is located 142 km east of Reykjavík and is magnificent to see where it cascades from the high rocks.
You can visit it in summer and if you´re driving on a rental car it is recommended that it be a 4x4. You can watch it both from the top of the rocks where you´ll enter from the parking. More interestingly you can walk/hike down the hill and walk tovards it and see it both from under and closer to it.
The walk takes between 1 and 2 hours, depending on how long you want to stay enjoying it.