Amy Schumer -- Flyin' High with Jerry Seinfeld (PHOTOS)

Amy Schumer and Jerry Seinfeld were high Friday ... over piercing blue tropical waters.

Amy, her BF Ben Hanisch, Jerry and fellow comedian Bridget Everett enjoyed an awesome afternoon in what we think is the Bahamas.

They're not college students, but Spring Break is for everyone ... especially when you're really, really rich and can do way better than Top Ramen for lunch.