第五天的行程是搭船遊萊茵河。郵輪起點是緬因茲(Mainz)，終點是科隆(Cologne)，全程需費時11小時，而觀光重點便是欣賞萊茵河(Rhine)沿岸的城堡。我們買的德國鐵路通行證(German Rail Pass)有送一趟免費的萊茵河郵輪之行。於是我們一大早就起床趕公車、火車到緬因茲，在一個好心的美國黑人帶路下，及時搭上郵輪(Koln-Dusseldorf KD German Rhine on the Rhine)。萊茵河最精華的一段就是從緬因茲到科伯倫茲(Koblenz)，需費時約5小時25分。由於我們時間有限，於是我們就搭緬因茲到科伯倫茲這一段，再搭火車到科隆，由科隆搭機飛回倫敦。
The fifth day of the trip in Germany is to take a boat trip on Rhine. The boat trip departs from Mainz and arrives at Cologne, which takes about 11 hours. We can take a boat trip to get the excellent view of castles along the river. The German rail pass we bought includes free transportation on the boats Köln-Düsseldorf KD Germain Rhine on the Rhine (Köln-Mainz). The boat departs at 8:45 am in Mainz. Therefore, we have to get up very early to catch the first bus and then catch the train fro Heidelberg to Mainz. We met a friendly American-African who led us the short cut to the port. We took the boat trip from Mainz to Koblenz, which took us more than 5 hours. We didn’t have too much time, so we had to take the boat trip, and then take the train to Cologne. After that, we would fly back to London.