Actually, it's more a tourist thing to do, but I've been on the Ebbelwoi-Express quite a few times and I really like it. You can watch out of the window and enjoy some nice applewine, water or Apfelschorle (I heard, it's also a typical German thing - applejuice and sparkling water mixed).
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It's a hop on - hop off thing and a nice way to get around and see something. It's very comfortable and covers a wide area of the city like Sachsenhausen, main station, zoo, and Frankfurt fair. Plus, you get to enjoy a ride in a historical tram!