Postman's Park is a secret hideaway. There are rarely anyone there at all, and always locals.
Regent's Park - London. Expansive, peaceful, picturesque, and a surprise around every turn for the newcomer. And I was lucky enough to attend a semester of college situated right in the middle of the park. No trouble finding a private spot to study or just "cop a squat" here!
Greenwich Park, London, England | Flickr - Photo by Simon Bolton UK
Stroll along the Thames on the Southbank by Old Father