The roller coasters are unmissable, if you can, do them, generally in the morning there are not many people; Harry Potter, the two cities and attractions are incredible. And other attractions like transformers, the mummy, Kong, Jurasic park and popeye etc. They are also very good. Actually, if you walk, you can do the entire park in one day, yes, wear comfortable shoes.
The whole park is interesting so I recommend 1 day per park
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