This waterfall on Oahu is not only the closest falls from Waikiki, but also one of the most stunning Oahu Waterfalls worth visiting on the island! A quick 15 to 20 minute drive will take you from the Waikiki hotels to the lush Manoa Valley. Manoa is recorded as the wettest spot on Oahu that receives more rainfall than anywhere else on the island. Just imagine the impact this has on this Oahu waterfall…! The trek up to the Manoa Falls is pretty much a flat trail, but can get muddy at times as you could imagine. Stay the course for about an hour, & you will find yourself staring up at one of the tallest Oahu waterfalls -150 feet tall!