Come along to see these beautiful mammals at their best on this exciting eco-friendly whale-watching excursions. Every December through April, thousands of Humpback whales migrate to the warm waters of Hawaii. Dolphins are likely to be seen, too. Morning-trip vessel Makai is is a fast and nimble open powerboat, with plenty of sea-spray likely on trips outside the bay or choose the afternoon trip on board the Sprit of Aloha catamaran for a slower more relaxed experience.