That is a big ass parking lot brother...
Some more info is needed such as is the main backbone going to only be in one location or will you have multiple sites to bridge from.
Generally I have set up a bridges at the main location to link to not root sites which have a crossover cable in them to an AP which provides coverage.
You will need the radio line of site as well as power at the remote locations.
since it is a parking lot there will be issues such as multipath to overcome. Since it is Canada, there will be weatherproofing issues to deal with as well.
You will need to perform a very thourough site survey to determine the power settings and antennas you will need. Don't pick out the gear first and try to shoehorn it into your situation.