What gift should college students give their father for his birthday?

The tree wants to keep quiet, but the wind will not stop; My son wants to serve his parents when they are old, but they are gone. What should college students give their father as a birthday present? Self-improvement and self-improvement are the best gifts. Secondly, according to my father's preference, I can send Four Treasures of the Study if I like calligraphy, Tai Chi Jian and Tai Fan Chi if I like Tai Chi, sports shoes and sportswear if I like fitness, and travel vouchers if I like traveling. ...