Yes, you can do Disneyland Paris in one day, but it requires aggressive planning and a "two-park" ticket if you want to see both Disneyland Park and Walt Disney Studios Park. Because the two parks are within walking distance of each other, it is physically possible to hop between them. To maximize your time, you should arrive at "Rope Drop" (park opening) and stay until the final fireworks show. In 2026, using the official Disneyland Paris app to monitor wait times and pre-ordering food via "Mobile Order" is essential for saving precious minutes. Many one-day visitors also invest in Disney Premier Access (the paid "fast lane" service) for marquee attractions like Spider-Man W.E.B. Adventure or Big Thunder Mountain to bypass long queues. A common strategy is to spend the morning at Walt Disney Studios Park to finish the smaller number of high-thrill rides, then spend the rest of the day and evening in the much larger and more immersive Disneyland Park. While you won't be able to experience every single show and attraction, a well-managed 12-to-14-hour day can cover all the major "must-do" highlights of the resort.