Like family outings doing fun stuff like swimming and building sand structures
They absolutely did! Check out these previous answers while you're waiting:
When did "going to the beach" become a popular, recreational activity? by u/thesoulphysician
When did "going to the beach" become a popular way to spend time? by u/MarcEcko
Did ancient peoples "go to the beach" as we do today? - multiple authors
Did ancient people go to the beach? by u/DarthPositus