What is the best first aid for jelly fish (box jelly fish) stung beside vinegar?

Box jelly fish sting. Plenty of vinegar and immediate care by emergency personnel. Supportive care (rescue breathing—as long as you're not contacting the stinging tentacles—and/or cpr) until expert help arrives. Less dangerous jellyfish stings can be treated with vinegar, salt water, rubbing alcohol (70% isopropyl), or commercial products for that purpose.