The best drinks in WDW are in Epcot. Best thing is DRINKING around the world!
In Mexico: frozen Margarita (the Fiesta Margarita; lime/strawberry/mango)
Norway: Carlsberg Beer
China: I had a ginsing Margarita...it was weird tasting, but I started to like it after a bit
Germany: Oktoberfest beer hands down the 2nd best beer in the park, pair it with a pretzel & sit by the water...its awesome & of course a shot of jager
Italy: Italian Margarita or Moretti
American Adventure: Sam Adams
Japan: Sake or Plum wine, can't go wrong with either because they both taste amazing
Morocco: Moraccorita
France: the last time I went they had the Orange slush, but they gave me a VERY big glass not a martini glass it was strange but VERY delicious
the UK: Rose & Crown for a pint of Guiness (make that like 3) & a Leaping Leprechaun
Canada: Molson Beer & listening to Off Kilter.
Can't go wrong in the Park

& of course at the Resorts there is usually a poolside bar with delicious drink selections! House of Blues also offers a happy hour during the week, I think it was like 4-6pm when I went, they have wonderfully crafted beverages there also. Captain Jacks at Downtown Disney has yummy drinks to. Hope that helps!!