One idea could be to get him a waterproof journal and a set of high-quality watercolor pencils or pens so he can easily sketch and paint while out in nature. You could also consider getting him a guidebook to local parks or nature reserves as a source of inspiration for his journaling. If he enjoys learning about different types of plants and animals, you could also look into getting him a field guide specific to your region. Another option could be a nature-themed guided meditation or mindfulness coloring book to help him relax and unwind during his nature journaling adventures.
Or you can get him a star map with the date when he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.