Check this out 133 caches in 100 miles. “The Bridge2Bridge Premium member caches form a series spanning the breadth of Central Scotland between the Clyde and the Forth estuary. At each end of the series are 2 iconic bridges; the Erskine bridge in the West and the Forth Road Bridge in the East. The series will take you along quiet country roads with views that you might otherwise miss if you were to cross the country by motorway.
It follows a meandering route of approximately 100 miles. Don’t think of it as a power trail that has to be completed in a day. There are many diversions and other caches en route to keep you going for quite some time.”