Manoa Falls is a 150-foot waterfall along the Manoa Falls Trail in Honolulu, Hawaii. Swimming in the pool below the waterfall is highly discouraged because there is a threat of becoming infected with Leptospirosis, a disease causing mild to moderate flulike symptoms that can last for 1 to 2 weeks. Many tourists are attracted to the waterfall and the scenery throughout the trail leading to it. Another attraction near Manoa Falls is the Lyon Arboretum, which preserves many endangered Hawaiian plant species. The hike to Manoa Falls and back takes about one hour. The waterfall and surrounding area experience rainfall almost every day, and flash floods can occur.