Many of the bars and restaurants can add the glow cubes (for a small price). And most can also make a chocolate martini. Over at Epcot resorts, you might like Crew's Cup at YC, or Kimonos at Swan (sushi place, but great drinks and really good with things like choc-martinis). At MK reorts, I agree on Tambu -- very fun bar with lots to watch and bartenders are awesome there. Also at MK area, the bar at the Wave at the Contemporary is fun, and good service. At all of these places you can also have some small plates or snack with your drinks if you get hungry. The places I've listed are all casual and easy going, you could wear shorts or jeans, or if you prefer dress up a little and neither is out of place. Great places to relax after big park days.
Have a great trip!!