As proof of my visit to the Pacific coast, I had to take off my shoes, roll up my pant legs and run in the ocean water barefoot.
The water was cold, but not unbearably so. This was just enough to tickle my toes and make me aware that yes indeed I was where I thought I was.
Scraping all the sand from my feet and from between my toes helped some, but I could still feel the ocean on my feet for the rest of the day.
Nice feeling.