Coral Reef at Palmyra Atoll National Wildlife Refuge (Photo credit: USFWS Pacific)
Fishing in the Maldives (Photo credit: Wikipedia)
corals. The picture was taken in Papua New Guinea (Photo credit: Wikipedia)
English: Coral reefs in Papua New Guinea (Photo credit: Wikipedia)
English: Table coral of genus Acropora (Acroporidae) at French Frigate Shoals, Northwestern Hawaiian Islands (Photo credit: Wikipedia)
This is a really interesting article by the BBC Travel blog
English: Whitetip reef shark (Triaenodon obesus) off the Hawaiian Islands (Photo credit: Wikipedia)
. Check it out!
BBC – Travel – Travellers’ impact on coral reefs : Eco-tourism.
Dr Alf's Blog 
Pingback: Slow road to Cyprus – Marilyn and Alf’s ten most precious memories « Dr Alf's Blog