highly recommend "penguin plus viewing platform", you can both see the penguins emergent from the sea and walk back to their home（really close to you, less than 1 meter!）, incredible! compared to any other options, it is the best view with a reasonable price!"underground viewing" is not recommended. it is inside an indoor place. you can only see the penguins through windows. how disappointed!To protect the penguins, no photos, no videos pls!