This quote beautifully expresses the warmth and happiness someone experiences in the presence of someone they deeply care about. The first part, "I can't say how much I like you and how special you are to me," acknowledges the difficulty in articulating the depth of their feelings. It suggests that words may not fully capture the extent of their emotions.
The second part, "but I can say that my world is full of smiles when I am with you," vividly illustrates the transformative effect this person has on the speaker's life. It implies that the presence of the individual brings boundless joy and contentment, as symbolized by the abundance of smiles.
In essence, this quote beautifully conveys the idea that sometimes, the most profound and special connections transcend verbal expression. It celebrates the simple yet profound impact someone can have on another's life, where their presence alone fills the world with happiness and smiles.