EPCOT: Grand Mariner slushees in France are quite good, UK has a full bar. Also consider trying the "Rosa Regale" in Italy--it's a sweet sparkling red wine that even people "not into wine" generally love. If it's cold, Viking Coffee in Norway is very good. Sure I'm missing a couple places around World Showcase.
Hollywood Studios: Tune-In Lounge, next door to Prime Time Cafe, has a full bar. Get there early if you want a seat. I believe this is the last full bar left in the park, tho. (Catwalk Lounge, you are gone but not forgotten...)
Animal Kingdom: Full bar in Africa, outside next to Tusker House (at least there was, haven't thought to check since they converted the restaurant to a buffet). Also an indoor full bar, with somewhat limited seating, in Yak & Yeti in Asia.
Magic Kingdom: No alcohol. But if you hop the monorail, each of the resorts has a highly themed bar. Quaff a "backscratcher" at the Poly and you'll be set for the rest of the day.
