Amazing trip! Incredible views of the Maui rainforest, waterfalls and coastline. The trip is really well though out with enough stops for the bathroom and food (please get the banana bread!). We stopped at some waterfalls and black sand beach, and we drove through the town of Hana.
Walter is so knowledgeable and fun, he told us about Hawaii history, traditions, the flora and fauna of the islands. It's a 10 hours trip I recommend being prepared, since it might rain in the forest bring comfortable shoes, sunscreen, and lots of water