I was in Maui last February. One of my favorite places. Lots of people have already hit on a bunch of the stuff, but:
- I did a complete drive around the island. Totally worth it. Roads in some parts are super sketchy. I think this is the road to Hanna?
- Paia is great. It's like a warm Tofino.
- Snorkeling Molokai was awesome.
- Meh on Haleakala. It was mostly cold and a lot of driving for not a lot of pay off.
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http://www.leodas.com/ -- go there. We did. Multiple times.
I can't really suggest any accommodations. We rented a house just behind Kapalua.