Should you happen to be headed east, bear in mind there's a compost cookie waiting for you at the end of the LIRR. The Montauk Milk Bar pop-up is a magical place of Arnold Palmers, cereal milk, and coffee slushies. Also, bench seats supported by milk crates. How fitting. Open Friday through Sunday until June 22, the newest member of the growing Milk Bar family goes seven days a week afterwards, through Labor Day. Check out the full menu here.