请教中欧20日行程，三月份天气冷，所以从南到北

DAY1 VIENNA
DAY2 LIJUBLJANA
DAY3 POREC
DAY4 POREC
DAY5 ZAGREB
DAY6 ZAGREB
DAY7 BUDAPEST
DAY8 BUDAPEST
DAY9 BRATISLAVA
DAY10 PRAGUE
DAY11 PRAGUE
DAY12 DRESSDEN
DAY13 DRESSDEN
DAY14 NUREMBERG
DAY15 BAMBERG
DAY16 BAMBERG
DAY17 RAGENSBURG
DAY18 RAGENSBURG
DAY19 VIENNA
DAY20 VIENNA