Hawaiʻi is expected to see its 10 millionth visitor this year. The Hawaiʻi Tourism Authority says in the first half of 2019, tourist arrivals were up by 4 percent even while visitor spending fell. Communities statewide are feeling the growing presence of tourists -- at local beaches and on the roads. Now, University of Hawaii researchers are asking how precisely are visitors affecting local neighborhoods – like those in Windward Oahu.