Officials estimate one-third of Disneyland visitors will be from mainland China, one-third from Hong Kong and the rest from Southeast Asia.
In a telephone survey of 1,500 mainland Chinese who lived in Beijing, Shanghai and Guangzhou, market research firm ACNielsen said one-third would either consider going or had decided to go to Disneyland.
Software engineer Zhou Ling for one, was enchanted by Adventureland, with its waterfalls, fake elephants, flaming torches and Cambodian relics.
"The stars and the sky are so beautiful, it's like a dream world here," the 28-year-old from Shenzhen said, after climbing down from the 19-meter high Tarzan Tree house, with her 29-year-old husband Chen Zhen.
It's not just the young mainland Chinese who are flocking to the park. Indeed children were in short supply on Monday as middle-aged "guests" wiped the sweat off their faces, waving and shouting at a passing river barge to the beats of the jungle and guffawing monkeys.