if you have a supply of seaweed go get it.
I used to collect the fronds of the beach after a storm. I would leave the stems as they do take time to rot down. I also used to put it direct on the ground as its full of nutrients and no weed seeds. dig it in other wise it stinks and goes all gooey. alternatively put it in your compost bin as it will be a good activator. I don't know about the fine for removing seaweed from the beach but some farmers in ireland, scotland, wales, cornwall and all over collect it to put on the land and in ireland I remember being told of trailer loads being taken to grow thier spuds in. I don't think anyone would object but then again there are some jobs worths about who say they don't want some thing but you can't have it either.
good luck.
