Offers sightseeing tours and swims with seals and dolphins in Port Phillip Heads Marine National Park. Seal sightings are guaranteed; dolphins aren't always seen, but there's a good chance. Snorkelling trips take in Pope's Eye (an unfinished military fort), which is home to abundant fish and an Australasian gannet breeding colony, before visiting a permanent Australian fur seal colony at Chinaman's Hat.

Even if you're not keen on snorkelling you can tag along as part of its sightseeing cruise, where you'll see plenty.