Waterfalls in Oahu with some popular hikes in Hawaii. For US hiking trails in Hawaii, there are tons of hikes on Oahu to choose during Hawaii vacation on the island and there are a few Oahu waterfall hikes too. Manoa Falls is near Honolulu and Waikiki, and Waimea Falls is on the North Shore. People go swimming at both. Outdoor travel destinations and activities for the bucket list for budget adventures! Put hiking gear and outfits on the Hawaii packing list!