Ok well then those are the elements that you would want to keep , I would use Photoshop healing tools to remove the metalwork and the signs And the skinny pine obstructing their view.
Then cut out the dog and bring him closer to the bench so it looks like they are together looking out on the tranquil lily pads.
Since we cant see their faces we at least could be looking over their shoulder .
Since the harsh light out there looks unpleasant to stare at, you need to drop those highlights.
Leave some of the tree branches as an internal 'frame' of their view , and possibly crop in a bit to direct the viewer into the scene.
For added interest , I would either consider adding an element from another photo , maybe a duck ,or a 'cloudy memory of days gone by', onto the pond
OR for more excitement use one of the distorting effects to create a tunnel as if they were being pulled out into a wormhole.
All this would take a lot of effort , I know that , but since the objects are so spread out , and their faces are turned away ..,
I don't think its enough to change the contrast or something simple and heroically create an entire new image.
But , I would consider that if you can at least get those glaring highlights down , that one of the paint rendering filters can help to unify an image.