First off, you better not tell them that your intention is to get married in Canada. You may say that you are visiting your girlfriend, friend, ect. Visiting is temporary, getting married is another topic- quite permanent, so don`t take a chance to get denied entry.
There is nothing like `normal tourist` time, you are from a visa exempt country and can stay for 6 months, unless the IO decides to give you a shorter timeframe.
You should show ties to your home country once you enter- your business helps, any lease, property ownership, letter from an employer with details of when they expect you to be back, paystops, proof of studies back home can help. If you entered Canada on several occassions make sure you carry as much evidence as you can with you as you might get selected to secondary inspection after a while. (Like myself- not fun.

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You can always extend your visitor visa once you are here. You get married, prepare the application for your PR and apply and you can apply for the extension with the receipt of PR fees and other supporting documents. Make sure that your PR application is sent before your visitor status is up and try to apply for the extension in time- they say 30 days ahead, but it is not really necessary, just make sure that CIC gets it before your visitor status would expire.
Apply outland, Berlin is much faster than inland and you can stay in Canada throughout the whole process. for some people I know it took less than 4 months- wish I could have applied through Berlin as well.

Good luck with your plans and do not stress to much, just be well prepared. Study the immigration process and how to apply and what do you need in advance as it is not 2 days to put it together.