We hiked the Pipiwai trail (a very easy hike) in Haleakala National Park which takes you through a bamboo forest. The section through the bamboo forest was one of the most peaceful places I have ever been. The hike ends at a waterfall where you emerge from under the trees into a valley with open sky. It really feels like you have arrived at the end of the world at the end of this trail.
We stayed at the Hamoa Bay Bungalow just outside of Hana. It was really wonderfully decorated with Balinese influences. The bungalow had a queen bed as well as an outdoor shower as well as a semi-outdoor tub (the tub is in an enclosed deck). It was also a short walk to Hamoa Beach. You can email hamoabay@maui.net for reservations.
Hana basically has no cell phone service so it is the perfect place to relax. We also found an excellent Thai place near the Hana community center: Pranee's Thai.