I do agree on the suggestion to make catching the jellyfish as a competition. Perhaps once a year with sponsored by local authorities & LADA. Make it an official event & awareness program to the people. Invite authorities such as the Hospital representative to talk about 1st aid treatment when encountered with the jellyfish. Perhaps Langkawi should have a guideline on know how to treat this jellyfish issue.
Make it as a compulsory for Hotels near the beach to have staff who knows how to treat tourist which effected by jellyfish sting.