The famous Jellyfish Lake in Palau has recently re-opened. It was closed in order to allow the jellyfish population time to recover. The lake is visited by countless people each year, and something as seemingly benign as a kick of a fin can kill multiple jellyfish at a time. I personally witnessed a guide (who you think would know better) barreling through them without any care whatsoever. I’m not saying you shouldn’t visit the lake. You should. It is an amazing site to see. But, if you do, please swim with care. — I’ll step off my soapbox now.