Without question one of the best episodes of Seinfeld ever. So many great storylines here from the ugly baby (which would reemerge in later episodes) to the shrinkage incident (which has been mentioned in Arrested Development, proving it's a big deal) to just about everything Kramer did in this episode.
"No, I'm sorry sister, not on my watch." This episode is just the quintessential example of how to write a sitcom with the cast on a trip. Many shows have tried, but in comparison they all fail compared to Seinfeld's "The Hamptons". Just a genius, Emmy-worthy episode of television here.