For those unfamiliar with presets, they are high quality filters that you can add to an image to enhance the clarity, adjust lighting/saturation and set the mood of the photo. Lightroom comes with lots of free preset options. Or you can purchase presets based on your preferred look and feel, below are some of my favorites.
The Light & Airy: Shop here
Lemon Blonde: Shop here
Presets for Good by Wyn Wiley: Shop here
123Presets: Shop here