Get FREE email communications from Fodor's Travel, covering must-see travel destinations, expert
trip planning advice, and travel inspiration to fuel your passion.
Only after pretty major storms in the Gulf will enough seaweed to notice kick up. While there is a row of "shells", mostly broken along the water line, it's much more a sand beach than a shell one.
We were there in January and I actually thought the beaches had quite a few shells/shell parts. It wasn't horrible but definitely needed something on the feet to walk on it and a towel to sit on.
I do walk barefoot on the Marco Beach, but I do not have tender feet. If your feet are really tender consider walking in flip flops or water shoes. The beach is beautiful-one of the most beautiful in the US.