Good all around zoo. Has all the animals and easy to see. Also an aquarium area.
Only a 20 minute drive.
The main attraction of this zoo is the Dolphinarium with Dolphin shows. The shows are in German only, but you don’t need to understand to watch the dolphins jumping and doing tricks. The entrance to the dolphinarium is an extra price available at the entrance.
1 hour north of Bonn
Showcases more native animals (but also has tigers and monkeys). It is a small, low-key zoo.
Just under 1 hour south off of the Rhine.
Highlights include the polar bears and penguins. About an hour northeast.