You played games on the beach (play beach games)
played beach games
You moved in the water (swim)
swam
You rested on a towel (lie on the towel)
lay on the towel
You made castles with sand (build sandcastles)
built sandcastles
run into water
ran into water
You stayed in the sun to enjoy the sunshine (sunbathe)
sunbathed
You ate food outside with your family or friends. (have a picnic)
had a picnic
You came to a place (arrive)
arrived
You picked up shells on the beach (collect shells)
collected shells
You used a camera or phone to make pictures(take photo).
took photos