Haleʻiwa is the North Shore's town in the singular. Everything north of it — Waimea, Pūpūkea, Sunset, Kahuku — is beaches and houses and the occasional food truck. Haleʻiwa is where the bank is, and the supermarket, and the surf shops, and the galleries, and the two shave ice counters that people queue outside in the sun.
It got there by rail. Benjamin Dillingham ran the Oʻahu Railway up this coast and, in 1899, built a resort hotel at the end of the line to give people a reason to ride it. The hotel is long gone and the railway with it, but the shape of the town is still the shape the plantation era left: low wooden storefronts along a single main road, a small boat harbour at one end, and the double-arched concrete bridge over the Anahulu River that everyone calls the Rainbow Bridge. Haleʻiwa carries a state historic, cultural and scenic district designation, which is why the buildings still look like this instead of like a strip mall.
For a visitor, the town is two things. It is a genuinely good stop — an hour of shave ice, browsing and a plate lunch, with a farmers' market and gallery scene that is not manufactured for tourists. And it is the bottleneck. Kamehameha Highway narrows through the centre and every car heading up the coast on a Saturday morning is in the same queue. The Joseph P. Leong Highway bypass, opened in 2012, lets through traffic skip the town entirely, and knowing when to use it is the most practically useful thing on this page.
The other thing worth knowing is the closing time. Haleʻiwa is not an evening town. Most of it shuts in the late afternoon and the dinner options thin out fast after seven. If you are staying up here, sort your evening before five or plan on cooking.