Vancouver is an ocean side city. Whistler is a resort town in the Rocky Mountains.
Vancouver is the nearest large airport to Whistler.
People fly to Vancouver, then take other forms of transportation to Whistler:
Link - http://www.whistlerblackcomb.com/getting_here/whistler_sea_to_climb/index.htm
Look along the left side of the screen to see other options like helicopters, buses, and more.
There's lots to see and do in and around Vancouver:
Link - http://www.youtube.com/watch?v=-enK5zZm_fc
Link - http://www.youtube.com/watch?v=8Os4_-u2xf0
There's lots to see and do in and around Whistler, too.
Link - http://www.whistler.com/
Link - http://www.youtube.com/watch?v=dewskSsSTV4&feature=BFa&list=FLj6powZaSK7c8osfWheBzHA&lf=plcp
There's lots of other things to see and do in British Columbia:
Link - http://www.hellobc.com/
Link - http://www.mydestination.com/britishcolumbia/usefulinfo/6176700/fun-facts
You should visit as much as you feel comfortable with.
Just don't try to do everything. You'll tire yourselves out too much to have fun.
Keep in mind that it's impossible to see and do everything.
British Columbia is huge: 944,735 square kilometres.
(And it's only 1 of Canada's 10 Provinces and 3 Territories and not the biggest one either.)
All of Mexico is 1,972,550 square kilometres
Also remember that October and November are Autumn months in Canada.
That means the weather can get colder than you're used to.
It can also mean you'll see snow up in the mountain where Whistler is.