Without even looking at the size of this image, we wanted to zero in on the girl and the boat while trimming out most of the unnecessary background. How???
First: Select the photo area Use the Select menu and choose All. Better: use the keyboard shortcut Ctrl+A (Win) / Command+A (Mac). You'll see a selection outline appear around the edges of the image in the document window. (Lovingly called the racing ants.)
Next "Transform Selection"
Again, using the Select Menu and choose Transform Selection. This gives you scaling handles all around the selection. You should still be able to see racing ants.
You might want to glance up at the tool bar and make sure the Move tool is NOT the active tool. If you do anything with that tool, it will affect the image. Otherwise, transforming the selection allows changes of the selection outline itself without affecting anything inside of the selection.
Next: Resize the selection outline To resize the selection, hold down your Shift key, then click on any of the CORNER handles (the little squares) and drag the corner inward. (Remember: holding the Shift key down forces the width-to-height aspect ratio of the selection to remain the same as you drag -- saving the aspect ratio of the original photo.)
You can also click inside the selection and move its selection outline. So we can move it to focus on just the girl and the boat. (Do not click the "target center" symbol of the selection.) You can change and move until it's just right.
NOW: Crop it
Once you're satisfied with your crop, hit the ENTER key to commit to the transformation.
Now, use Photoshop's Crop command up under the Image menu. When you select Crop, Photoshop commits to the cropped version of the photo you created, while maintaining the exact same aspect ratio as the original. Sweet.
You can now kill the by using the keyboard shortcut Ctrl+D (Win) / Command+D (Mac) You'll note in my version, I also used the Clone Stamp Tool (Tap 's') to remove the two outlaw swimmers causing a distraction in the water!
Happy Shooting ... and thanks for reading...