The Regent's Park
The Regent's Park (as it is correctly referred to) is west of Camden, and north of Marylebone Road. It is a well maintained park with flower beds, lakes and much open grass suitable for sports and picnics. It was designed by the architect John Nash in 1811.
The Inner Circle of the park is particularly well kept, and has an open air theatre, which is used for performances during the summer.
To orientate yourself, the Telecom Tower is at the south eastern corner of the park.