It welcomed a capped number of visitors who had to pre-book tickets, have their temperatures checked on arrival and show a government QR code designed to prove they are not a health risk.
On a warm and hazy morning, speakers on a recorded loop asked people to wear masks at all times and reminded them to obey social distancing, including in queues and on rides.
Staff held signs instructing "please maintain a proper social distance from other guests" and yellow lines and posters on the ground showed people where to stand when waiting.
Disney said there would be increased frequency of sanitisation and disinfection, and the park will limit or suspend performances that often include interaction between visitors and characters such as Mickey Mouse.