Whale watching is Kaikoura's signature experience. Boats head into the deep water off the peninsula, where sperm whales are the main draw and dolphins, seals, and seabirds often add to the trip.
Tours depend on weather and sea conditions, so avoid making this your last possible activity before a long drive or flight. If you are prone to seasickness, take it seriously; the canyon is close, but the Pacific can still be rough.