This month's Outside magazine suggests you can use vodka instead of pee!
You´re lucky you didn´t come across this critter: http://mexiconewsdaily.com/news/huge-jellyfish-filmed-off-puerto-vallarta/
It would scare the piss out of me!
This month's Outside magazine suggests you can use vodka instead of pee!
Topically or internally ?

Never had a problem in Mexico, but....
There was something in the ocean in Varadero Cuba, some clear, jelly-like, thumb-sized "objects". I would bump into them when swimming, but really couldn't see them. I was told by locals that they don't sting at certain parts of the year.
As far as "sea lice", I have seen and gotten bitten by tiny, shrimp-like creatures in the ocean in northern Brazil (Sao Luis, Maranhao state), enough to make me leave the water, but they left no visible mark or itch/sting after they nipped. The local fishermen's kids called them "fish lice" (piolio do pesce).
If ammonia in pee is supposed to work on jellyfish stings and you want to be a bit less crude, try those AfterBite pens made to relieve mosquito bites. They are mostly ammonia.
Thanks for all the replies.
Funny we were in Varadero several years ago and never experienced anything like this.
Looks like I'll be buying my wife one of the ecostinger suits bajadude suggested.
I guess so: We've been going to the same spot at the same time of year for several years and this only happened this year and in 2015.
Jellyfish are unpredictable they follow currents and food. Here one day, gone the next.
I would say jellyfish flow with the currents and carried by the wind......
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