Well, let's think about this. If your boss is kind and generous, a thoughtful gift would be a great way to show your appreciation. A personalized mug with a note of thanks, or a gift card for a favorite restaurant or store could be a good choice. If your boss is more stern or demanding, a nice gesture, such as a sincere thank-you note, could be a thoughtful way to show your gratitude. Ultimately, the best gift is one that comes from the heart and shows that you care.