Is there a good exchange where I can withdraw to PayPal? Is there a good and trustworthy bitcoin exchange where I can trade my bitcoins for CAD and then send the money in my PayPal account instead of a bank transfer? Thank you
Short answer: No.

Long answer: PayPal does not allow Bitcoin exchange accounts. Bitcoin exchanges pop up like mushrooms these days so a new one might fly under PayPal's radar and get an account going for a while. But it will eventually get shut down.

So trustworthy exchanges won't try to use PayPal, as they know their accounts will be seized. And you shouldn't trust those that are using PayPal because they're operating with high risk. Knowing the high risk.

PayPal's CEO talked about Bitcoin as a funding option on PayPal in an interview during the last couple of months.

Until that happens the answers above are unlikely to change.