The Dead Sea...indeed far too salty for known "life" forms, having the highest level of salinity and density of any body of water in the world. (30% greater than our typical oceans)  It is, however, rich in minerals such as potash, magnesium and bromide.  

When you take a dip you are like a cork!!  It's true!  We went for a brief dip in the sea and you just lean back and pick your feet up to float on your back.  Curl your legs up and it's as if you are in a chair.