Southeast of Kahului in Polipoli Spring State Recreation Area on Maui, the Polipoli Loop is an easy 5 mike hike. It combines 3 trails: Haleakala Ridge Trail, Plum Trail and Redwood Trail. To reach the trailhead, follow SR37 (Haleakala Highway) to Keokea. Turn right on SR337 for 0.5 miles. Turn on Waipoli Road heading up for 10 miles. Look for well marked trailhead parking area near campground.
Here are some notes on adventuring in Hawaii. First, unlike mainland forests, the tropical island forests can grow very dense and can mask dropoffs. Plus, the trails can be very wet and slick most of the year (December to February is the main rainy season, but expect rain all year round). Stay on the trail to avoid disorientation. Second, speaking of disorientation, be aware that most Hawaiian topographic maps use the Old Hawaiian Datum. When trying to use the latitude/longitude from those maps with a GPS unit, you will think you are 0.4 miles south/southeast of where you really are. Kind of important in a dense jungle. Third, the bacteria Leptospirosis is found in the local waters and mud. It causes flu like symptoms within 2-20 days of contact, and can be fatal if not treated with antibiotics. Fourth, when hiking about, walking sticks can be very helpful for stablity in the slick conditions, for probing mud hole depths and clearing webs of the tiny crab spider.
Overall, Polipoli Loop is the 32nd most popular hiking trail of all 45 hikes in Hawaii.