I had a couple of other thoughts since time is of the essence.
I believe that most high academic gap year students take the gap year after being accepted by a college. Your situation would be different as you would be applying to colleges again in a few months. Think about any facets of the application process last year in which you relied on your high school teachers and counselors. You will probably need them again, so give your high school a heads up about going through the application process again.
Also, you might have a good PG option in Florida with The Bolles School. I think they offer strong academics and a very good baseball program. I know the published tuition and board are very expensive, but like with private colleges you never know about the bottom line until you speak with them.