Πηγές-Μέσα
As already you've seen, you have the choice of browsing the certain sources you were given before in the previous tag. You can use other sources if you want. It's up to you . The result is what matters most!
For your convenience again, you can start with the official site of the greek organisation of tourism.
http://www.visitgreece.gr/en/greek_islands/rhodes
http://www.visitgreece.gr/el/downloads/guides/dodecanese_islands_travel_guide