Can you swim in the water ?

If you're a competent swimmer, you'll be fine.

Yes you can swim in the water just be careful of some of the waterfalls and there are no sharks in Patapsco State Parks Waters maybe a few giant snapping turtles but other than that you are fine I used to swim in multiple areas I used to swim in multiple areas of Patapsco State Park when I was younger

There are snakes tho. My our family saw 2

Yes

I also heard about the snakes. That is super scary.