Actually Portugeese Man-o-Wars are not that bad. What me and my family can attest is - with time the shock of sting gets less and less. I.e. if you never got stung - be carefull since sensetivity varies a lot. That was very funny (for the rest of us) to watch our very macho friend to jump around on the beach for an hour after first sting in his life. Especially considering that in the middle of the show my 10 year old son get out of the water and ask my wife: Mom - I got stung with that blue thingy - you said that it can be dangerous and I should tell you that I got stung but it don't bother me much so can I go and spearfish for little more? Bottom line - man-o-wars annoing but I will definietely swim with them.