IMO, I'd say that the little islands surrounding/near Bidong are the real gem rather than the main island itself. Places or sites to look for when you're around there is called Pulau Gelok Darat, Pulau Yu Kecil, Batu Putih and Midway Reef. These are my favorites, there are so many other sites that I've not been so maybe there are more that someone else would like to share the info here.