The haunted house is so cool and a Magic Kingdom classic ride. You will need to do fastpass on the best rides. All of the roller coaster style rides are very popular. We stayed at Pop Century and breezed into the theme park using Extra Magic Hours. A multi day pass lets you do all the rides at a cozy pace.
Casey's corner menu is so great. The food is so good at the Magic Kingdom. Kids will love the regular, plain Orlando hot dog like they make at hotdogheaven.com plus they can load it up. I do enjoy going to nathansfamous.com a lot, and casey's corner is close. You can see a review of that sandwich on the menu! If you do go for a plain dog, there's still nothing keeping you from some extreme toppings and lots. The great condiment bar featuring sauerkraut, onions, red onions, salsa, jalapenos, ketchup, hot sauce and mustard.