Explore the museum's exhibits: Cosmocaixa Barcelona has several permanent exhibits that cover a wide range of scientific topics, including Earth sciences, biology, and physics. Some of the highlights include the "Climate Change" exhibit, which explores the causes and effects of global warming, and the "Human Evolution" exhibit, which traces the history of our species from the earliest hominids to modern humans.

Visit the planetarium: Cosmocaixa Barcelona has a state-of-the-art planetarium that offers daily shows and presentations on a variety of astronomical topics. Children will love learning about the stars, planets, and other celestial bodies in our universe.

Play in the science playground: Cosmocaixa Barcelona has an outdoor science playground called the "Jardí de la Ciència," which is full of interactive exhibits and activities that teach kids about scientific principles in a fun and hands-on way.

Attend a workshop or demonstration: Cosmocaixa Barcelona regularly offers workshops and demonstrations on a variety of scientific topics, such as electricity, magnetism, and chemical reactions. These interactive events are a great way for kids to learn about science in a hands-on and engaging way.

Take a break in the gardens: Cosmocaixa Barcelona is surrounded by beautiful gardens, which are a great place for kids to take a break from the museum and enjoy some fresh air. The gardens are home to a variety of plants, flowers, and animals, and offer a peaceful and relaxing place to rest.

Have a picnic: The gardens at Cosmocaixa Barcelona are a great place to have a picnic, especially on a sunny day. Pack a lunch and find a spot on the lawn to enjoy a meal with your children.

Go on a nature walk: Cosmocaixa Barcelona is located in the Collserola Natural Park, which offers a variety of hiking trails and nature walks. These trails are a great way for kids to explore the outdoors and learn about the natural world around them.

Visit the gift shop: Cosmocaixa Barcelona has a gift shop that sells a variety of science-themed souvenirs and educational materials. This is a great place to pick up a souvenir or a gift for the science-loving child in your life.

In summary, there are many things to do at Cosmocaixa Barcelona with children, including exploring the museum's exhibits, visiting the planetarium, playing in the science playground, attending workshops and demonstrations, taking a break in the gardens, having a picnic, going on a nature walk, and visiting the gift shop. This science museum is a great way for kids to learn about science in a fun and interactive way, and is sure to be a hit with children of all ages.