JAL,
I second the sentiment to bring your clubs(Kapalua Plantation, Makena North & Wailea Gold are the island's best 18's by far), but differ on a few Maui experiences. I assume you will be there in the next few months and therefore privy to the big wind/wave season. The Island's Northshore (from Hana to through to Kahului is perhaps the "Pine Valley" of wind/wave sports.
At Hookipa's public park (set on a bluff over Eastern side of the reef break) you will witness the world's very best Wind & Kite Surfers skying off of clean reef-breaking wave sets that hammer the island every day starting about 10-11am. Go into the quaint town of Paia and grab a "shave" (ice-made flavored drinks from coffee-to any fruit) and head down to the beach to watch these spectacular athletes throw themselves 20-30 feet up in the air and land with ulitmate precision. Slightly further west of Hookipa is the friendly beach of Sprecklesville where even more wind and kite surfers play the wind and waves. As someone who used to sail & kite here, it is really and easily the very best site in the world to participate and spectate at.
As for the drive to Hana, it is a slog, albeit a beautiful one and the idea of others driving is wise. Given that it does take nearly a full day, I'd recommend either the ferry to Lanai (for wonderfully beautiful and solid golf) or the Haleakala Bike Ride. Both are way more fun.
Lahaina (an old Hawaiian Whaling & Fishing village) is very touristy and overdeveloped. So is Kannapali. A better experience would be had by heading out to Kihei, Paia, or anywhere "Upcountry, (Kula or Makawao)" (the hills) for food and sights.
The restaurants are plentiful, but my all-time favorite is easily the Hannimaille General Store in Makawao for upscale and the Paia Fish Mkt. for downscale. Both serve lunch or dinner and are not to be missed.
Sorry to babble, but I used to go to Maui every year for nearly a decade (to surf, etc) and simply love everyhting about the island. IM me if you want more.