There are 29 locks on the Caen Hill of the Kennett and Avon canal, which are compressed into 2.5 miles. This section has the most locks in a very short space, and often has canal boats negotiating the hill. It also has a good view, plenty of space for the kids to run around (beware the water!), a tea shop and space to picnic.
More information about the town of Devizes and a picture of Caen Flight is available at this web site.
This cache requires you to solve clues at one location in order to work out the coordinates for the final physical cache. It's all easy, requires no more than a mile of walking (mostly on a gentle hill) and will take about half an hour in total. There are even proper footbridges to cross the canal instead of balancing along a lock gate.
Look for the sign at the above coordinates with a blue border. In the bottom right hand corner there are seven digits. Let these digits be ABCDEFG.
Now insert the digits into this equation to get the coordinates: N51°21.BF(B-A)', W02°01.D(G+B)C'. The checksum of the six missing coordinates is 23.
Now find the real cache which is an ammo box. When replacing the cache please ensure it is hidden from view in every direction.
If you are travelling by car then you may like to park in the Caen Flight car park (£3). Enter the access road at N51°21.388', W02°01.807' and drive to the top of the road. Alternatively park for free at the bottom of Caen flight in a lay-by near the canal bridge.
Please beware of feeding the Swans, they can get aggressive.
Please check out the Geocaching Association of Great Britain offering support for Geocachers in GB.