It's a Principality between Spain and France, tucked in amongst the Pyrenees. There are great little runs in Soldeu and some great Apres Ski. March is the perfect time to go. We drove up there from Valencia. You can fly to Barcelona and travel by road from there.
the link below will take you to a super little hotel in Arinsal (Andorra), almost opposite the main lift leading to the Arinsal-Pal ski area. http://www.hotel-micolau.com/h_eng/inicio.html