Rule, Andorra is a tax-free shopping paradise. In summer there's great hiking, mountain biking and you can also walk the Via Ferrate (iron roads) which are tiny trails on sheer cliff faces with safety wires hammered into the rock that you attach yourself to. The rope bridges are exhilarating (if you're not afraid of heights).
Have a look at the WorldNomads.com safety tips here:
PHil almost 8 years ago