We are staying in Providence for a few days in June 2018. We would like to hire a car and go see some of Cape Cod if possible - mainly for a nice lunch at a decent sea-front clam shack or such like. (We are fond of sand dunes and salty air, after all!) We know that driving all the way out to Provincetown would just take too long but Google Maps says it's about 1.5 hours' drive from Providence to Barnstable (for example); is this realistic in June? (I've heard that Cape Cod can get pretty snarled with tourist traffic in summer.)
Anyone got any recommendations for a nice spot to have lunch along the south of the Cape? Maybe there's a nice alternative somewhere off the beaten track?