

Here's a tutorial on how I achieved the look above.
Step 1: Add an adjustment layer that turns the image black and white

Step 2: Add a Color Balance adjustment layer, select highlights, and move the dials towards the red, magenta, and yellow. This will warm up the bright areas of the photo.

Step 3: With the Color Balance window still open, select shadows, and move the dials towards the red, magenta, and yellow. This will warm up the bright areas of the photo.

Step 4: To get the soft, dreamy look and punch up the contrast a bit. Duplicate the layer that your photo is on. Go to Filter > Blur > Lens blur then play with the threshold and radius to get nice bright spots that will highlight the sunny spots of your photo.

Step 5: Select the layer you've just blurred and change it's blending mode to "Soft Light"

Step 6: Now lower the opacity on the image so that the "dreaminess" isn't overpowering. (Unless that's what you're going for) In this case, I just wanted a subtle hint of it.

And now you should have a nice split tone dreamy effect on your image. I'd love to hear thoughts or other tips that you may have concerning this photo or tutorial.