You can park at Bekken (32 V 573411 7030391) and follow the trails to the moon! (This place is called Månen - the moon). Continue the path a few hundred meter past the viewpoint.
Remember that this is a night-cache and is impossible to find at daytime. You start at the given coordinates above, and point the flashlight around you. You will soon catch the sight of the reflex signals that will lead you to the cache.
If you hold the light source too far away from your eyes, you will not see the reflexes. The easiest way is to use a headlamp; if you use a flashlight, hold it close to your eyes.
Be careful, there are a lot of obstacles that are difficult to see in the dark! Bring extra batteries with you, remember you must also find your way back home afterwards.
Feel free to take a picture of the moon on the moon and post it here.
There is also a great view of Trondheim-by-night at the nearby viewpoint (32 V 574565 7029896
Have fun!