I spent a few days on Maui in late January of this year. The last two days I was there I did some kayaking at Olowalu and Makena. Saw lots of humpack whales at both spots.
I launched from Makena Landing early the morning of January 26 with hopes of seeing some humpbacks on the water. Saw several whales near other boats for a couple hours, then a pair began swimming straight towards my kayak.