Using Photoshop Elements --- Auto-Levels

1) Select the sky using the Magic wand. Set tolerance to 40. Use shift,alt to add/reduce to selection.
2) After selection, choose adjust auto levels. The sky must turn blue and dark this time.
3) Right click to deselect. We will notice a sharp contrasty edge between the auto-leveled sky and the leaves. We can tone the edges down with combination of color burn, blur and smudge tool. Just experiment with it.
4) Do the same thing with the swimming pool water.
5) Adjust overall contrast/brightness.
6) I had it done in 25minutes.