Daytime Fun
If you love to golf, the Village Course and Bay Course at Kapalua is really challenging and scenic. Someone described the Village Course as golfing on a course in a jungle. They also have a golf academy there and you can take lessons, they have a lot of different lesson programs. The Plantation Course at Kapalua is where the Mercedes Championship is held it is not for the meek. Unbelievable course and very beautiful. Down the road south of the Valley Isle Resort is the Kaanapalli Golf Course. Very nice and fun to play.
Kaanapali Beach
Kaanapali Beach is a fun place to hang out and enjoy the beaches and lots of activities there. Lots of restaurants and lots of people so for me it is probably good for one day; unless you hang out at the Sheraton it is all the way at the end near Black Rock. It is really good place to snorkel, a great beach and at sunset they have cliff divers. Have a drink or two and watch them light the torches on the cliffs and dive.
Haleakala
Inactive volcano crater that forms the south part of the island of Maui. Popular spot for watching the sunrise and hiking. Plan to spend a half-day or more depending on any side trips.