Not sure you're answering the question posed. Question isn't about passport or benefit of PR canada. I think he / she is wondering about traveling after landing BUT before PR card arrives for re-entry into Canada. If that's the question, there are two scenarios
1 - You're from a visa exempt country - then generally you may be readmitted on the basis of your visa exempt benefit. Now depending on when you travel, I believe CIC is soon going to be requiring an e-travel document for everyone!. I'm not in Canada but I understand the start date of this e-travel document coming on stream is very soon.
2 - NOT from a visa exempt - I advise you NOT to travel until you get your PR. CIC has an option to get a special travel document for re-admittance while waiting for your PR. Two problems - (1) You have to apply for this document outside Canada (2) The time it takes (90days) to get this document is about the same time to get your PR. In extreme circumstances you can send a letter to CIC , explaining the urgency of your circumstance and may be able to get the travel document sooner - death in immediate family, CIC lost your PR card in the mail etc.
Thanks. I am not from Visa exempt country, it does make sense to not travel then!