There was an article in the Sunday Times about the top ten snorkeling sites, worldwide.

Here the Bali bit:

THE LIBERTY, TULAMBEN, BALI
Most shipwrecks lie in deep water, but part of the Libertyís stern section rises to within three metres of the surface, just a short swim from the beach. In fact, the abandoned cargo ship rested on the shore until 1963, when the nearby volcano, Gunung Agung, exploded, pitching the 6,000-ton ship into the sea and splitting the hull in two.

The wreck attracts a great deal of marine life, including a friendly school of bigeye trevally ó streamlined silver fish that group together in impressive twister formations. Visibility is changeable, but is usually adequate to view the tangled topography of the wreck from the surface.

I based myself in Sanur, a sleepy resort town in the south of Bali, staying at the Sativa Sanur Cottages (00 62 361 287881), a friendly little hotel, for £44 a night. English-owned AquaMarine Diving (00 62 361 730 107, www.aquamarinediving.com) will pick you up at your hotel and take you to Tulamben and back for £44, including snorkelling and lunch. They can also arrange trips to Baliís other great snorkelling site, Pulau Menjangan, on the northwest coast.

EQUIPMENT
A snorkellerís most important tool is the mask. In the shop, try one on, breathe in slightly, remove your hand and lean forwards: the slight suction should keep the mask in place if it makes a good seal with your face.

SAFETY
There are plenty of poisonous creatures in the sea, but none of them seeks to attack people. The golden rule is not to touch anything: if an animal is moving so slowly that you could grab it, the likelihood is that it has a formidable defence mechanism.

If you plan to snorkel from the shore, buy fins that can be worn over neoprene booties. Even with protection, it is advisable to shuffle through the sand so that any stinging beasts have the chance to flee. Sharks in the tropics are wary of people and only eat fish. The exception is the tiger shark, which sometimes stalks pods of dolphins. Tigers hunt in the late afternoon, so never swim with dolphins after 6pm. Flailing snorkellers look too much like injured dolphins.

Have you replaced the citronella with something???????