Right, you don't get a tourist visa if you are PR.
You have two options. Apply for a PR travel document in order to return. Another option, if you have or can get a US visa, fly to the US and enter Canada at the land border with your expired PR card.
It is also an important question whether you meet the RO (residency obligation) and if you don't, then whether you have mitigating circumstances for why you don't.