Beach with baby?

Elizabeth
I'm due right at the end of May (the 27th). My fiancés birthday is August 18th and every year we go to OBX for a week with his family for his birthday. Obviously the baby won't be building sand castles or playing in the waves but I am trying to figure out how we should handle the trip. Will any time on the beach with him be feasible or should I keep him inside the beach house the entire time? If it is ok to sit on the beach with him-how long is too long? What should we have for him? I'm a FTM so I don't really know what to do with a 2 1/2 month old let alone what to do at the beach with him. I super appreciate any advice!