So, The easy way now seems to be setting up a puzzle cache for him to go and find. The published coordinates are the location of this picture I took:

I was inspired by the nature of the trackable to refer back to the old BBC Micro game I played back in the day, based on a shooting gallery, called 'Carousel'.
The trackable is sitting in the cache, and I would like Den Sure Kalkun to collect it, so if you beat him to it and do happen to see Duckling 4, please discover it rather than removing it.
Solve the puzzle below, and you'll have the coordinates to a brand new cache.

You can check your answers for this puzzle on GeoChecker.com.
The cache is placed with the kind permission of the Natural Heritage Service, who are based in Hermitage of Braid, and who also oversee many of Edinburgh's other green spaces.