Manoa Falls Trail, Oahu Hawaii hikes. For US hiking trails in Hawaii, tons of hikes on Oahu to choose during Hawaii vacation on the island! Doing the best hiking trails on Oahu also gives you other things to do with nearby beaches for swimming, snorkeling, and to see turtles! List of planning tips for when in Waikiki or Honolulu. Outdoor travel destinations for the bucket list for budget adventures! Put outfits and hiking gear on the packing list!