Museum fur Post und Kommunikation (Museum for Post and Communication) - A museum all about communication, it's really geared for kids, with lots of multimedia exhibits of the history of postal services in Germany (those Thurn und Taxis again!) and elsewhere. Don't miss the upstairs area with hands-on activities: a printing press, bits of electronic junk and glue guns (great for older kids), a working pneumatic tube mail system, drawing and painting, plus a nice cafe where you can get very good brownies.
Stadel Museum - This is the biggie art museum in Frankfurt, a biggie anywhere in Europe, for that matter. You'll find works by Dutch painters Rembrandt, Bosch, and Vermeer, and Impressionists Matisse, Renoir, Degas and Monet, but be sure to check out the German painters, Durer, Cranach, Hans Holbein the Younger, and Max Beckmann.

After you've done the museums, you can also go swimming at the public pool on Textorstrasse or head for Stadtwald - south of Sachsenhausen, this big park is great for strolling, especially in the section called Louisa Park, with its little lakes.

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