Radha's favorite activity is climbing trees.

Explanation:
Climbing trees is a physical activity that involves using one's hands and feet to ascend and descend trees. It requires strength, balance, and coordination. For some people, climbing trees can be a thrilling and enjoyable experience. It allows them to connect with nature, experience the outdoors, and challenge themselves physically.

Climbing trees can provide several benefits and experiences for individuals, including:

1. Physical exercise: Climbing trees involves using various muscle groups, such as the arms, legs, and core. It helps in building strength, endurance, and flexibility. Regular climbing can contribute to overall fitness and well-being.

2. Connection with nature: Being in nature has a calming and rejuvenating effect on individuals. Climbing trees allows people to immerse themselves in the natural environment, breathe in fresh air, and appreciate the beauty of their surroundings.

3. Adventure and excitement: Climbing trees can be an adventurous and thrilling activity. It offers a sense of freedom, challenge, and accomplishment. Overcoming obstacles and reaching new heights can boost confidence and self-esteem.

4. Observing wildlife: Climbing trees provides an opportunity to observe birds, squirrels, and other creatures that inhabit trees. It allows individuals to appreciate the biodiversity and interconnectedness of the natural world.

5. Cognitive development: Climbing trees requires problem-solving skills, critical thinking, and spatial awareness. It helps individuals assess risks, plan their movements, and make decisions. This can contribute to cognitive development and improved decision-making abilities.

Overall, climbing trees can be a favorite activity for individuals like Radha who enjoy physical challenges, nature, and adventure. It provides a unique and enriching experience that combines physical exercise, connection with nature, and cognitive development.