Hi Manuela,
My top recommendation for a 2 year old is the Magic Kingdom. There are so many fun attractions there that you'll both love. Your 2 year old can ride any of the attractions where he/she meets the height requirements. You can find a list of the attractions with height requirements by visiting the
Traveling with Little Ones section on the Disney World Website. There you will find a PDF file on the right side of that page that lists attractions at all four of the theme parks that have height requirements.
My top attractions for a 2 year old at the Magic Kingdom would include Dumbo, The Minnie Adventures of Winnie the Pooh, "it's a small world", Peter Pan's Flight, the Walt Disney World Railroad and the Magic Carpets of Aladdin. The
Move It! Shake It! Celebrate It! Street Party is fun for Guests of all ages (check Times Guides when you enter the park for performance times).
You know your child better than anyone, but keep in mind that just because an attraction doesn't have a height requirement, doesn't mean that every child should ride it. Haunted Mansion is a great example of this - there is no height requirement but its dark and once you're on, there is no great way to get off of this 7 minute and 30 second ride.
Let me know if you have any questions about any specific attractions - I'm super happy to assist you. Wishing you many magical memories :-) Allison