Most visitors from Western European countries do not need a visa to enter Canada, however it's always best to check with your local Canadian embassy.
Visitors holding American citizenship can enter Canada with just their drivers license and another peice of identification. It's always advisable though to bring your passport as this is always preferred, and more reliable.
Most visitors can stay for up to 90 days in Canada however if you wish to stay longer you will require a tourist visa. While you may be able to find under-the-table work at resorts and farms or orchards, you need a work visa in order to legally hold a job in Canada.