Select the option of pickup at your Oahu hotel or make your way to the Honolulu airport to catch the 45-minute flight to Maui.
Upon touchdown in Maui, meet your local guide and transfer to your air-conditioned coach. The tour's first stop is the Haleakala Crater, up a winding road that ascends 10,000 vertical feet in just 37 miles (60 kilometers). As you drive, peek out the windows at the fantastic views of Maui's west side and listen to your guide's commentary about the history and geology of the island.
Disembark to see the volcano's gigantic crater — 2.5 miles (4 km) wide, 7.5 miles (12 km) long and 3,000 feet (915 meters) deep. This dormant volcano last erupted in 1790, but the landscape around the crater is still bare and free of vegetation. Chilly temps at the summit mean you might want a jacket or sweater on hand.
Head down from the barren otherworldliness of Mt Haleakala to the vibrant jade rainforest of the Iao Valley. At the Iao Needle, an unusual rock formation, you'll have 60 minutes to explore the area's waterfalls and swimming holes on foot via an easy hiking trail. Stop for lunch (own expense) midday.
Travel to the charming town of Wailuku, where you'll have time to walk around at your leisure and check out the historic Ka'ahamanu Church.
After a solid 8 hours of exploring Maui's highlights, return to the airport for your flight back to Oahu.