-Go to Maluaka beach in the morning to swim with a creep of tortoises (if you're lucky!).
-Be sure to check out Haleakala for the sunrise. As of last year, they have started a ticket reservation system to be up there during sunrise. When I went in late August 2017, we didn't catch the sunrise due to these tickets, so we caught the sunset instead which was also well worth the trip.
-Ululani's Shave Ice.

We were there almost every day.
-Road to Hana. If you do this (and you probably will), there will be no cellular reception along the route, so don't buy a cd guide. Purchase the Road to Hana Gypsy app (
https://gypsyguide.com/tour/road-to-hana-maui/). It's a little pricey, but well worth it. It gives you a tour and some excellent information for your trip, complete with prompts and landmarks if you'd like to stop by other places.
-808 Grindz cafe for breakfast. Their macnilla sauce pancakes are #fire
+1 for Old Lahaina Luau. They're definitely the best!