While researching a bicyle touring vacation in Maui, I came across this Maui County Bicycle Map, which is kinda nice. It shows suggested routes around the island as well as some elevation profiles for some routes (including directional tradewinds).
Maui Bicycle Map
Unfortunately this online version is low-res, so I can't make out the elevation marks. Paia to Hana: does that max out at 1400 or 3400 feet or 5000 something? Inquiring minds want to know!