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Maui is my favorite. Keep in mind that showers are common in February, but it does provide for more interesting skies. Just to the south of Kihei, Ulua Beach is excellent, and farther south is Makena beach. The drive to Lahaina has many great views, including the overlook for whale watching. I saw too many whales to count this past February, some right along the shore. On the same drive is the Maui Ocean Center, an excellent aquarium.
On the other side of the island, don't miss the Iao Needle which is north of Wailuku.
For longer drives, there is the trip to the summit of Haleakala, with many spectacular overlooks. Start drving up from Kihei maybe three hours prior to sunrise or sunset. Either is good, but if you go for sunset, you can actually see whether the summit is clear from the base of the mountain, before you go. In February, it is possible for snow near the summit.
The Hana Highway is pretty much a day long adventure, but worth the efffort. In the winter, there is usually enough rain to keep the waterfalls going full bore. On the way to Hana, don't miss the Keanae Peninsula. Also, one of my favorites on the island is on the left side, just before Hana, Waianapanapa State Park. It has a black sand beach, lava tubes and freshwater ponds in caves complete with freshwater shrimp. There is a spectacular trail from the parking lot to the south, which is along the ocean and goes to a Heiau which is one of the largest. If you have the time and inclination, you can go past Hana to an area called the Seven Sacred Pools or O'heo Gulch Pools.
Have a great trip!