101 bike routes in scotland – harry henniker
the ultimate scottish cycling book – paul lamarra
both books were published 2003 – 4 ,but have an old fashioned feel, both give good routes in the highlands that can be easily extended .
from my own experience – cycling around ardnamuchin and mull are stunningly beautiful, and easy to access ; the island of arran is also a great starter cycling detination for a long weekend , and even easier to reach . to be honest both areas dont really need a guide book – just a map and go ! jura is also stunning , and you dont even need the map as its 35 miles road/track out and back !