One of the best is Puohokamoa Falls, with good swimming and a nearby picnic table. Then Puaa Kaa is a tiny park featuring two picturesque waterfalls in the midst of some colorful foliage. The paved pathway takes you across the top of the first falls, about 25 feet above a pool while it leads you along the stream toward the bottom of the second, about the same height. Then about 10 miles from the village, you'll come across the Seven Pools of Kipahulu. Here water stairsteps down the slope, pouring from one pool to another until reaching the ocean.
Swimming is excellent in the pools, but dangerous in the sea below.
On a quiet day there's probably no better place on Maui for a picnic. A few miles north of Hilo, just off Route 19, is Akaka Falls State Park. It features a shady, half-hour walk along a paved path fragrant with flowers and vines. First you come across Kahuna Falls, which plunges a mere 100 feet. But then you round the corner to see Akaka Falls, which has a 442-foot vertical drop.