At Maui Tropical Plantation, near Wailuku, is a 60-acre working plantation where visitors are introduced to Maui's commercial crops, including papaya, pineapple, guava, mango, macadamia nuts, coffee, avocado, bananas, sugar cane, star fruit and more. There are tram rides, evening barbecues, a nursery and a gift shop of products.
While clearly designed for the tourist, the 40 minute tram tour is a fun experience in that you get some close up views of many of the types of flowers, plants, and fruit trees found in Hawaii. The tram runs daily, starting at 10 a.m., and there's a small fee to ride. Adults $11.00 each plus tax, Children ages 3-12 $4.00 each plus tax.
The prices for many items in the gift shop are actually quite reasonable. If you're looking for Mauna Kea macadamia nut products they have some good prices here.
Clearly, Maui's botanical gardens are about something much more than botany. They are places where the life of the land can flourish despite the pressures brought by growth and progress.