With Paypal, you have to have a US-based USD bank account to transfer the funds over to. A lot of Canadian banks should have a US-based branch that you can get an account set up with.
I am with CIBC, and have been able to link my US-based USD bank account to paypal. I don't rent using a third party. Usually directly through the Disboards or through Facebook and have renters send me the funds in USD to Paypal. I then transfer it from Paypal to my US-based bank account. From there, you can also transfer it into your Canadian based USD account with the same bank fairly easily. I only do this since that's where my US dollar credit card is linked and how I can pay off my USD credit card when needed.
Prior to this, I did just use the Paypal balance to purchase Disney gift cards to pay dues or use on Disney trips. It usually all goes back to the Mouse anyways...