Certainly! Let's break down the usage of "some" and "any" in the context of your sentence: "Don't you know __some/any__ good restaurants in Vancouver?"

1. **Some**: This word is typically used in positive statements and offers or requests when we expect the answer to be "yes." For example:
- "I know some good restaurants in Vancouver."
- "Would you like some coffee?"

2. **Any**: This word is generally used in negative statements and questions, especially when we are not sure about the answer or when the answer could be "no." For example:
- "I don't know any good restaurants in Vancouver."
- "Do you have any questions?"

In your sentence, "Don't you know __some/any__ good restaurants in Vancouver?", you are asking a question and the structure is negative ("Don't you..."). Therefore, the correct word to use here is "any."

So, the correct sentence is:
"Don't you know any good restaurants in Vancouver?"

This usage aligns with the typical pattern of using "any" in negative questions.