I've been to Frankfurt a few times. It's ok.
Can't really remember there being that much to do though. There's a few museums, the Rhein and that's about it.
Wiesbaden (an hour by train south) is a really nice place. The fussgangerszone (sp?) is great and there's a funicular that goes up the hill just outside the city. There's also a great forest area for walking around. There's also a hot water spring and the world's biggest cuckoo clock.
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