Okay, kiddo, so Dead Horse Bay is a place that used to be a farm a long time ago where people kept horses. But now, it's a special place in New York City where there are lots and lots of old things that people threw away a very long time ago, like bottles and cans, shoes, and even old toys.
You see, a long time ago, people would just throw their trash in the water or leave it on the beach because they didn't know any better. That's why there are so many old things in Dead Horse Bay. The things that people threw away a long time ago have now been buried in the sand and rocks, so they're still there today.
Even though it's called Dead Horse Bay, there aren't any dead horses there anymore. But the name comes from the fact that people would take dead horses to the beach a long time ago to be turned into glue, which is what they used to stick things together before there was tape. But don't worry, they don't do that anymore.
Nowadays, people like to go to Dead Horse Bay to explore and see all the old things that are still there. It's like a big treasure hunt! But it's important to be careful because some of the things can be sharp or dirty. We should always be respectful of this special place and not leave any trash behind.