Haleakala ATV Tours: Fun trips with ATVs on Haleakala Ranch land. Riders must be at least 16 years old. Nonriders can follow along in Hummers or rugged vehicles. 661-0288 www.mauiatvadventures.com

Maui ATV Tours: Ride ATVs on ranchland. Also, they have a special all-terrain vehicle that can take groups to some nice off-road locations. Lahaina/Ka'anapali 667-7777 Kihea/Wailea 874-7400 1-800-624-7771

Haleakala Bike Co.: Coast a bike downhill from Haleakala at your own speed, whatever that may be. They also rent bikes and offer some tours. 575-9575 1-888-922-2453 www.bikemaui.com

Maui Downhill: Choose from three different downhill bicycle “safaris,” including one that features a sunrise at Haleakala. 871-2155 1-800-535-2453 www.mauidownhill.com

Mountain Riders: Choose from several downhill bike tours, both guided and self-paced. 877-4944 1-800-706-7700 www.bikingmaui.com

Maui Eco-Adventures: Leads ecologically minded private and group hiking, biking, and cultural excursions. 661-7720 1-877-661-7720 www.ecomaui.com

Hidden Adventures Jeep Tours: Offers uncrowded half- and full-day four-wheel-drive adventures to some of Maui's hard-to-get-to beautiful places. 1-877-464-6284 www.mauibound.com

Sugarcane Train: Ride a steam locomotive between Lahaina and Ka'anapali. For adults, it's $15.95 round-trip and $9.95 for kids ages 3–12 (free for those younger). They also have a dinner train. 667-6851 1-800-499-2307 www.sugarcanetrain.com