Whale Watch sightseeing excursions in Maui run Dec.16th – May 14th. See the Humpback whales as they frolic in the warm waters of the Hawaiian Islands. Whale Watches are 1.5 hours to 3 hours. $19-$79.95. Some are bare-bones simply looking for Humpback Whales in Hawaiian Waters while others include BBQ lunch and Cocktails. They are all fun!