I spent about four hours on the beach again today. I have been walking barefoot, holding on to the flip-flops.
One reason is that I wish to allow my toe blister to heal before I wear the Crocs again; another motive being that I am of the belief that walking barefoot toughens the soles of one's feet, thus eradicating years of hard skin.
It must improve the natural "foot-print", too. Our feet are spoiled by a lifetime of mollycoddling in comfortable footwear.
Being abroad in a hot climate affords a great opportunity to harden up the soles.