After AIP they will complete the medical, criminality, and security checks. Once that's done, they will advise you that processing is complete, and that the local CIC office will contact you for an "interview" (which is a landing; and it's a simple process like getting a driver's license). At that appointment, you will be given a paper (Confirmation of Permanent Residence (COPR)), and will be told to expect a PR Card in the mail within 6-12 weeks.
Once you have the COPR, you will go to Service Canada to get a permanent Social Insurance Number (SIN), and will go to the province's ministry of health office to get your health care straightened.
Once the PR Card comes, you can freely travel to and from Canada. After 5 years, you will need to renew that card.