When I first came to Germany, I did not speak German, and a good way I found information about Kaiserslautern in English was at the German-American Community Office, located across the street from the city hall in Kaiserslautern. The office was originally set up, I think, to assist the American soldiers stationed at the bases near Kaiserslautern, but it's also a nice source for all non-German speaking visitors. There is also a tourist information office located across the street from the big bus stop (next to the Fruchthalle). They are friendly and will be happy to assist you in English as well...
...aber für mich, spreche ich ein kleines Deutsch jetzt!
Favorite thing: This is the Fritz Walter stadium on the "Betzenberg" hill. It is the most impressive building of the town and can be seen from almst every place in Kaiserslautern. The stadium is currently undergoing a massive restoration because of the 2006 World Cup that will take here. The renovation for the World Cup began in 2002 and has not been finished yet.