Whale Watch sightseeing excursions run Dec.16th – May 14th. See the Humpback whales as they frolic in the warm waters off 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!