$activities_label = get_post_meta(get_the_ID(), "activities_label", true);
...
while($query->have_posts()) :
  ...
  if (false !== strpos($activities_label, '|') && false !== strpos($activities_label, PHP_EOL)) echo $activities_label;
endwhile;



//view
Blue Elephant
400 thb|Rose
200 thb
300-600 thb|Blue Lagoon

The Blue Lagoon
400 thb|Rose
200 thb
300-600 thb|Blue Lagoon

Scandic Bar
400 thb|Rose
200 thb
300-600 thb|Blue Lagoon