I think this is an EA Sports ad card. There is an EA Sports logo in the corner. The German on the card translates to: Heroes Wanted! Oberhausen in located between Duisburg and Essen. In 1954 they began hosting the International Short Film Festival and is one of the oldest short film festivals in the world. Short films are 40 minutes or less.  Five hundred films out of about 7000 submissions are chosen each year to be shown at the festival. 

The sender says she is "un-sporty" but loves to swim and to hike. She just got back from hiking in the Black Forest.  The Black Forest has a large variety of hiking trail that cater to beginners and experts; short hikes and days long hikes. The Schwarzwaldverein (Black Forest Club) laid out many of the trails in the 20th century. The best known is the Westweg (West Way) and it is a challenging hike with many steep inclines. Circular hikes were added in the 1950s.  The  Barfußpark Dornstetten (Barefoot Park) is a 2.4 km hiking trail where hikers are encouraged to go barefoot for its medicinal value. 

This character is from a German book series called  Die Känguru Chroniken (the Kangaroo Chornicles). The story starts out with a kangaroo ringing the doorbell and asking the person for ingredients for making pancakes, and then needing the stove, and then moving in where they then become flat mates. The kangaroo is a communist and doesn't seem to want to pursue stable employment. Kangaroo's flatmate is Marc-Ewe and apparently the two of them bicker, are jealous of one another, and spend a lot of time with each other. The Kangaroo is a Vietnam War veteran, fighting on the side of the Viet Cong.  The Kangaroo Chronicles was made into a movie combining live action and computer animation. There was a sequel released in 2022.