Answer:
I am the yellow hem of the sea's blue skirt.
Usually green but can be brown. It's a great place to play or lie down. What is it?
What stays in one corner but travels around the world?
You'll have to consult an optometrist if you want to improve this.
What occurs four times in every week, twice in every month, only once in a year but never in a day?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?