Hyannis Whale Watcher Cruises is the Mid Cape’s only whale watch. Trips generally run from 3.5 to 4 hours long. Cruise through Barnstable Harbor to the Cape Cod Bay, while an expert naturalist talks about your surroundings, and the vast marine life of the Cape. The number, and species of whales differ from trip to trip- but with a 99% sighting rate, you are sure to see some whales and the other marine animals that inhabit the Cape Cod Bay.