Grand Mariner Orange Slush
In 2003, I had what was then called a Malibu Macaw at 'Ohana (I think it's called a Tropical Macaw now), and it was my favorite until I had the Peach Snap at the tea kiosk in China. It's a slushie drink made with Peach Schnapps and green tea, and although I'm not a tea lover, I thought this was awesome!
Lapu Lapu, Poly Bar
Grey Goose Slushie
Grand Mariner Orange Slush
I second that, along with the Pina Colava. The Grand Marinier slushie (along with the Grey Goose Slushie) can be found in a France Kiosk just outside of the pavillion and the Pina Colava can be found at any WDW bar.