When arriving on Gorgona by boat, we already saw 2 whales playing or mating right there, within eyesight from the beach. We could see them jumping and splashing around whenever we went out for diving.
The highlight was seeing a humpback whale while diving, only 2 or 3 meters away from us. Absolutely incredible.
Here a video we took: http://youtu.be/U5JQRFitF4E