There is an extensive network of cycle and footpaths around the North of Edinburgh, many of them disused railway lines. The evidence of the train routes is all around - platforms, bridges, tunnels, supporting brick columns and the sharp stone chips on some of the paths.
The best way to do this one (include 'The Other Side of Edinburgh' in your route) is by bike. It is worth investing in the 'Edinburgh City Bike Map' (£4.95) produced by Spokes (www.spokes.org.uk).
This cache is along the Water of Leith Walkway. There are many access points to the walkway, but two suggested for this cache are at N55 58.347 W003 11.275 (the No. 11 bus will take you here from the city centre), or N55 58.141 W003 11.665 where there is a small carpark. Nearby is spooky Warriston cemetary - the scene of a grisly murder in one of Ian Rankin's novels. There are good blackberry picking paths around this area at the right time of year.
The cache contains:
Packet of replacement Xmas tree light bulbs
A bottle stopper
An APS film
A pair of earrings
Some slipper socks (kids)
A packer of powdered hot chocolate