When I think of ambience the first thing that comes to mind is light!
Light can set the mood or tone of your image. Just think how the ambience of the day can change from sunrise to sunset. Bright days can feel enchanting, cheerful, even optimistic whereas a low light day often feels dreary, moody or even mysterious.
As you go through your day, take notice of the landscape around you at various times. How does the ambience of the day change? Do you prefer the morning or evening light?