This is a nice shot that suffers somewhat in the lack of detail that is recoverable, particularly in the forested area. The problem is of course the large expanse of a much lighter sky area.
One method would be to use the Lasso tool and draw a line around the entire Forest/Grass area and then use the Plus+Gamma control to lighten it to where it's more compatible with the sky. It will appear a bit too light at this point and a further application of Negative (-) Gamma will restore the proper density to the land part and also slightly darken the sky/clouds as well.