One way to save on transportation and sightseeing in Europe is to take advantage of government-issued passes designed for foreign travelers. But beware: many must be bought in the U.S. in advance, an inconvenience offset by the fact that they will thus be immune to any vacation-time decline in the dollar. The pick of the passes:
> Eurailpass gives unlimited first-class train travel in 15 European countries (not including Britain), 15 days to three months ($190 to $460), covers some lake, river and sea travel, with reduced rates on other transportation.
> Portugal's free...