I don't know the logistics part but I can say this, enjoy it while it lasts, your kid will be 19 before you know it. Whenever my parents and I are in Disneyland they start to tell my sister and I how much they miss when we were toddlers. If they had a time machine I feel the would leave me and go back to those toddler Disney trips!
Also I was able to handle Space Mountain and such when I was four. Don't underestimate what your child can and cannot do. I think my family was dragging my sister on the Haunted Mansion when she was two!