In Ixia area you can find the Medieval catholic monastery of Filerimos.
Historical sightseeing (Italian historical buildings and architecture)
Medieval Historical monuments
In Rhodes Island you can find Archaeological sites (Ancient Acropolis, Ancient Theatre and Stadium, Ancient Kamiros, 
Lindos and many more)
Aquarium, the Water Park, Luna Park, Extreme Sports (bungee jumping and more)
Wonderfull beaches throughout the island for every taste / prefference (sandy, pebble or rocky)