First trip 2, 2 1/2 or 3 years old?

[2Pirates2Princesses]

I also agree with 2.5 years for the fact that they are still free in the parks and Disney buffets and also there isn't much of a difference in what they can do in terms of height/rides. However, like a pp mentioned, if it was a choice between 3 and 4, I'd go with 4. 4 is that magical age developmentally and most 4 year olds are at or near that magical height of 40 inches.