Just back from Maui; did two of my favorite rides:

-- Wailea-Kihei-Kahului-Kula-Haleakala Crater & back. About 93 miles and 11,000 ft. of climbing. It's the whole day, and not something I want to do more than once per year.

-- Wailea-Kihei-Lahina-Kanapali-Napili-Wailuku-Kihei-Wailea (West Maui loop). I strongly recommend this one, despite the warnings you see in the maps. This is paved the whole way, and includes some incredible scenery on the north coast of West Maui. About 82 miles & 2,500 ft. of climbing.