One of the main reasons I am a strong advocate for manmade hard structure reefs along the New Jersey coastline, aside from beach protection. Imagine that... on days where there's a swell, the surfing potential. When it's flat, the spear fishing potential... just swim out with your sling, a flag, and a bag, and take home a fish or two dinner. That's something that "sand bag" structures won't give you.
Ditto. It wouldn't be all that hard or too astronomically expensive since almost all of the East Coast states have large amounts of cheap granite (it's not the type that gets turned into counter tops) and limestone that can be cut into flat slabs that would make a great surfing reef with plenty of fishing and other recreational benefits. Problem is getting a municipality to pony up the dough to get it done.