Florida Fauna - ID’s?

Took a trip down to Siesta Key FL last week and got up early each morning to take a walk on the beach and wade around looking for critters or shells or whatever before the other tourists ravaged the areas. The beaches were pretty bare most days, just shells that would wash up. One morning, however, the currents must have been just right. Tons of urchin, various algae, all sorts of critters. Also a number of cell phones and pairs of sunglasses.
Here are a few random shots of the macro algae & inverts I came across. I would love to have ID’s on any of them.