Kahului is where most people land on Maui, and for a rider it is the last flat, tidy, six-lane stretch of the day. The town sits on the isthmus between the two volcanoes, with Haleakalā's enormous grey-green shoulder rising to the south and the older, jagged West Maui Mountains to the west. It is a planned town, laid out by the sugar company in the middle of the last century to house plantation workers, which is why it feels more like a grid of shopping centres and bungalows than a postcard. That is fine. You are here for the practical things.
Do them properly before you leave. Kahului has proper fuel, more than you will see again until you are back, and a big wholesale store near the airport is known for cheap petrol. Eat something real, because the Hana Highway has food stands and banana bread but not much in the way of a sit-down lunch, and fill your water bottle. Wailuku, the old county seat, is a few minutes along and has the better old-fashioned coffee shops if you want to do the morning properly.
The ride begins by heading east on Hana Highway through sugarcane country that is mostly fallow now; the last big mill at Puʻunēnē closed in 2016, and the fields have been going to grass and new crops since. After Pāʻia, a former plantation town that turned into a surf-and-sunscreen stop, the road narrows, the trade-wind rain forest closes in, and the numbering starts to matter. Locals count mile markers rather than corners, and the famous tally of hundreds of curves and dozens of one-lane bridges is not exaggerated. Start early.
A word on weather. Kahului itself is dry and breezy, and the leeward side can be bright and hot while the windward coast is soaked, so pack a rain layer even when the airport is blazing. If it has rained for days, landslides and flooded stream crossings are possible on the far side, so check conditions with a local before committing. Otherwise, this is a rare place where the best part of the trip begins ten minutes from baggage claim.
The north shore beyond Pāʻia has some of the best wind and waves in the Pacific, and you will pass the cliff lookout at Hoʻokipa where windsurfers and turtles share the water. Keep that in mind when you are tempted to hurry through the first few miles: the opening is half the show.