Take the bus on the street in front of or behind the building. Foreign tourists go to Xiamen Du Dong Cruise Terminal Center to buy tickets and take a boat. You can also book tickets one day in advance, because there is a limit to the number of people going to the island every day.
Local tourists can take a bus to the ferry terminal on Lujiang Road (opposite to the Customs Building), which is a special passage for local citizens to go to the island.