In Canada we have 2 choices, the contact and the visual apprach.
You can request a contact approach and ATC will provide separation from IFR traffic and "issue specific missed approach clearance if any doubt exists that a landing will be accomplished."
If however you request or ATC suggests and you accept a visual approach you have no missed approach clearance.
Especially at non controlled airports you had best be aware that you have, in fact, cancelled IFR and must remain VFR. If you are not confident you will be able to land a Visual approach is not a great idea.
AIP RAC 9.6.1 and 9.6.2
http://www.tc.gc.ca/CivilAviation/pu...AC/9-1.htm#9-6
Clear as mud? Great! Carry on.