Vice President Joe Biden and his wife, Jill, have hit the Hamptons. The couple are believed to be staying through the weekend at the home of Internet pioneer and gay and transgender rights activist David Bohnett — a longtime friend of the Bidens whom they visit every summer — on First Neck Lane in Southampton. The Bidens surprised residents by strolling around Main Street yesterday and stopping for lunch at popular spot 75 Main. A witness said the VP had a burger and fries with a Diet Coke and Jill had lobster salad and a glass of chardonnay. The spy said, “Joe posed for pictures with all the guests, and told owner Zach Erdem they are staying until Sunday.”