The best Hilo, Hawaii things to do include Hawaii volcano tours and go Hawaii sightseeing Big Island waterfalls. In Hilo there are 3 well known Hawaii waterfalls Rainbow falls, Akaka falls and Umauma falls. Big Island Volcanoes are nurtured yearly with 200+ inches a of rain supplying the largest Hawaii waterfall 420ft Akaka Falls, the 3 tiered Umauma Falls & Hilo’s easily accessible Rainbow Falls. Just downstream from these popular Big Island waterfalls are amazing falls flowing over towering seacliffs into the Pacific Ocean. A Hawaii photography dream tour of awaits you on-board the luxurious high speed 49 passenger aluminum catamaran “Lavaone”. Hawaii Tours to Big Island waterfalls depart from Hilo’s Wailoa harbor near the Suisan fish market.