At Naxos, if you can walk/hike 45 minutes, you can visit the waterfalls. You have to go till Keramoti and park the car. Then follow the instructions/arrows/path towards the waterfalls.
Do not imagine a huge waterfall, it is a small and cute one and you can have a nice hike with lots of opportunities to see birds! So ideal for birdwatchers!
Check out our video where you can see a bit of the way to arrive!
The video was taken in April.
Please do not waste water in general but when in a greek island, try to take even more care. In August lots of times the islands face shortages of water.
Respect the environment and if it happens to find in your hiking garbage, be so kind to take them with you and do not leave them somewhere, where they do not belong and can cause trouble.
Thank you!
Yannis and Stella @Apollon, Naxos 