How about a customized journal with an image of his favorite wildlife or nature scene on the cover? You could also consider getting him a set of quality colored pencils or markers to enhance his drawings. Another idea could be a book on nature or a guided nature journal that provides writing prompts and guidance. If he likes to venture out, you could consider a guided nature trek or a camping trip in a location known for its natural beauty.
Or you can get him a star map with an important date you share.
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.