Create a mood board with the theme of 'Dog Park'. The image should include diverse elements you would typically find in a dog park. These elements could include various breeds of dogs playing and socializing, dog owners of different genders and descents, such as a Caucasian woman playing fetch with her dog, a Black man sitting on the bench having a quiet moment with his furry friend, a South Asian family enjoying a picnic while their dog is playing around them. Include other elements like a water fountain, a dog-friendly agility course, and wide open green spaces sprinkled with trees and shrubs. The atmosphere should invoke feelings of joy, comfort, community, and outdoor fun.