The pavement in portions of Disney is not smooth, so I don't know if heels are a good, or safe, idea.
Quick clarification - I get the feeling that when most people think heels they envision stillettos. Yeah, not so much my style. But there's a lot of heels that are broad and very safe. Heck, I've climbed rocks and gone hiking in my heels before. Thinking about it more, my hiking boots have 3/4" heels. So did my dad's army boots. Go figure. So back on track, there's lots of heels out there that are very safe for even off-road stuff.
Personally I've yet to see how crocs are safe - they seem like your foot would be slipping around in them like crazy and I KNOW I'd twist my ankle at some point or send a shoe flying (if worn without the back strap engaged) but despite all my illusions many people (including small kids) wear them without problem so apparently they work!