Oh how I wish the Cosby Show actually had an episode where the cast took a vacation at a Disney park. Sadly that never happened, but we do get a glimpse of what sort of magic might occurred in this ad from 1987 starring three members of the cast. In it, Clair, Theo and Rudy jump around the Walt Disney Resort showing us just how great a time could be had (they even spend some time at EPCOT).
As a Disney and Cosby Show fan, this commercial made quite an impression on me at the time. Sadly the video quality of this particular recording is not great, but the sound is nearly perfect.