Wailua Falls, Maui

At 80 feet tall this is one of the biggest roadside waterfalls which makes it a popular place to visit. However, being next to the roadside means that parking is very limited especially during high season. If you can wake up early enough, you'll get to enjoy your surroundings with few people in attendance. To get there drive on Hana Highway to mile marker 44. You'll see the waterfall from the road.