Maui has a ton of scenic beauty. The West Maui resort area has stunning views of Molokai and Lanai in the distance, It is a great place to enjoy a day at the beach, spot whales, or witness a colorful hawaiian sunset. There are world-class resorts with miles of sandy beaches. It is a playground for those that golf, scuba diving or surf. Maui is one of the most beautiful places on earth. If there was a downside, it would have to be the traffic and expense. To get anywhere, you must travel on the perimeter highway, and it's usually bumper-to-bumper. And you'll pay more for a hotel room, food and gas than anywhere else in the U.S., but you probably already knew that.
If you want to experience the awesome views of Haleakala National Park, you will want to allow plenty of time to drive from the resort areas of West Maui. This trip can take at least 2-3 hours each way. My advice is start your trip very early in the morning. There will be several bicycle groups riding downhill that you're likely get stuck behind on the way back. The road trip to the top of Haleakala ends at 10,000 feet in elevation, so bring warm winter clothes if you want to do any hiking up there.
An even more difficult adventure is taking the Road to Hana. It's not for everyone, and if you're not behind the wheel, it could be a real headache due to the more than 100 hairpin turns along the rainforest coastline. There are several waterfalls near the road along the way, but many you'll never see unless you buy a good book with detailed maps and directions. This scenic drive is best experienced if you allow at least one night stay in Hana. Otherwise, you will spend most of the day in a car. A much easier and worthwhile trip to a scenic place on Maui is to the Iao Needle, located near the center of the island. Zoom in on the map to see the exact location.