Today I was in Destin, Florida and I ran 10.5 miles on the beach.  I ran without my shoes for the first time since my early 30s. Running barefoot on the beach is a good idea when I regularly ran 5 miles in Vinece Beach, CA.  Today I ran on the fine white sands and I did not have nay problems.  I do not think I will run that distance again without shoes.  At mile 8 I was starting to get some sand related abrasions on my feet.