If you have the flexibility, I'd wait to see how the weather is panning out for the season. A lot of people are predicting a 'super el-nino' which could mean a lot of things (rain, high-freezing temps, etc).
Places like Big White & Whitewater have base elevations around 1700 m which may help. Also consider what type of terrain you are looking for. Some places (like Kicking Horse) have lots of steep alpine terrain, whereas other places (like Whitewater / Red) have mainly steep trees / glades with little alpine.
Also, most places are at least a couple hours apart (if not more), and the driving can be sketchy (again we'll see what el-nino brings). Consider how much driving / travelling you want to do. Personally I'd limit it to 1-3 resorts max. I'd rather spend more time on the mountain than travelling.
Not sure what your riding level is, but if you're coming from Ontario, you'll probably find plenty of in-bounds terrain to keep you stoked. Most resorts out here have loads of 'off-piste' terrain (that can be pretty wild / gnarly) that will make you feel like you're out-of-bounds without as many of the associated risks. If you're going into the backcountry, make sure you have all of the avy gear and know how to use it. Given that you are travelling alone, it would be best to hire a guide or go with a heli / cat-ski group.
If its your fist time in the mountains and you're only here 5-6 days, I personally wouldn't bother with it.