Dens Park is the home ground of Dundee F.C. and Tannadice Park is the home ground of Dundee United F.C.. They are in the same street, Tannadice Street, in Dundee.
Yes and no. There is an area that is commonly used as a skate park, but it was never built or officially designated as such (to my knowledge, at least). It's called the Literary Walk. It's the place...
In the U.S., such a designation requires passage of federal legislation. This usually involves both houses of Congress passing a bill, and the President signing the bill into law.