Just to make things confusing, Primrose Hill is the name of a London district, a royal park within that said district, and a hill within that said park. People tend to refer to Primrose Hill as the district, while the park gets banded together with the much larger Regent's Park directly opposite.
Primrose Hill is one of the most exclusive and expensive areas to live in London, but even if you can't afford the postcode, there is one thing you can get for free: the view.
The hill is two hundred and fifty-six feet high, and though you're in for a steep climb, it's well worth it once you reach the top. On a clear sunny day, you'll get a beautiful view of Central London; even if it is overcast, it is still a breathtaking sight (or maybe that's the climb).
Like Regent's Park, Primrose Hill was appropriated by Henry VIII, but not officially given Royal Park status until 1841. In 1842, it then became open to the public.
The park is popular with sightseers, dog walkers, kite-flyers, and sun bathers.
Apart from the hill, there aren't really any distinguishing features, although it does have a shrub patch. So whilst it may not be as impressive as Regent's Park, if you in the area, it is a great place to clear your mind.