Israëls shed his academic style before he was 30. Thereafter, from what I can tell from images of his works on the internet, his style became quite sketchy, though he did not distort colors or proportions of his subjects. So he was a modernist to only a limited degree.
They were probably headed to the Netherlands East Indies. This was painted a year or two after Israëls left the Royal Academy of Art in The Hague.
Hirsch was a department store found in several European cities, including Amsterdam.
Israëls painted many beach scenes.
This seems to be from around 1930, judging by the hairdo and costume.