If you're looking for an indoor activity on a rainy afternoon, head to the Aquarium Sea Life Paris Val d'Europe. This fascinating aquarium is home to a diverse range of marine life, including colorful fish, sharks, turtles, and even penguins. You can wander through the various exhibits, learn about different species, and even have the opportunity to touch some of the sea creatures. It's a great way to spend a few hours and escape the rain while immersing yourself in the wonders of the underwater world.