As suprising as it may sound, Six Flags Great Adventure, despite its many areas crowded with rides, food, and games does have some nice "park-like" areas. A good portion of the interior has lots of big trees. The lakefront has also been left relativaly park like, but is starting to get built up. I wish Great Adv. did have more areas that are very park like, it would be a nice escape from the crowd.
Off-topic, but I think GAdv. might be able to ease some of its crowding problems if they spread out their rides more. They have so much room, except most of their rides are cramed into little areas such as Movietown, Olde Country/Fantasy Forest, and Frontier Adventures. They have the space so use it.