Try this site:
germany-tourism.de / tuebingen (it's in English!)
I'm ashamed to say I didn't do any touristy things when I lived there, apart from wandering along the Platanenallee (island type thingy in the Neckar) and sitting in the beer garden by the side of the river - but it's probably a bit on the nippy side for that at the moment. The old town is lovely, and if you like local food I know a good restaurant... can't remember the name of it so I'll find out.