When you land, they will ask you to leave a Canadian mailing address, so that they can mail your PR Card to you later. You can also change that address later on CIC website after you land. Remember it has to be a Canadian address.
It's happened to someone before that they refused to take the address, which means they refused to send the PR Card because they didn't believe the moving was permanent. Usually they wouldn't know you are going to be here for only 2 weeks unless they check your plane ticket. Just in case, can you show them an one way ticket?