“There was a picturesque park with rolling hills and tennis courts, and in the fall it filled with hard, brown, fallen acorns that I used to college and on occasion toss at friends.”               –  Fort Greene Dreams by Nelson George

Picturesque means something that is beautiful and charming. Nelson George was using this word to describe a very beautiful park that had all of these features.
adjective; charming or quaint in appearance

an image of picturesque park & fort greene park
http://www.nycgovparks.org/photo_gallery/full_size/10265.jpg