Blowhole
The blowhole blows regularly, even in relatively calm weather. In really rough storms with high tides, the waves can crash over the top of the blowhole. The area is unfenced. Take care.
Penguins
Penguin tours run nightly. Book ahead during summer as the tour is capped at 120 people / night. In summer up to 800 penguins come ashore nightly, but this falls off to almost none over winter.
Be nice to penguins
Stay still, don't shine a torch on the them or use flash photography. They have their route from the beach, and will stop or retreat if you are in their way. Back off to the side slowly. Control children.
Aquarium
There are two aquariums in Bicheno. One on the highway, and one by the Gulch.
Apsley Waterhole
This waterhole provides the water supply for Bicheno. Its a pretty spot, around 10km from the town centre. Take the signposted turn at the northern end of the town. You can swim there. It is cold, but still possible. They ask that no sunscreen be used when swimming, so appropriate water clothing. You can snorkel there too.