There is a parking lot with toilets by Hofskirkja, one of the nicest churches in Iceland covered with grass.
How to Find Parking lot with a toilet by Hofskirkja
Just turn off the Ring Road to the village of Hof.
GPS coordinates of Parking lot with a toilet by Hofskirkja Parking lots with WC : 63.907022, -16.707289 Take me there!
Photos of the Parking lot by Hofskirkja:
The Nearest Parking lots with WC - toilets