Thanks for your suggestions. Very very useful to know people's opinion and help me narrow down my list from the million suggestion that Google throws at you.

So, I have
a) Highway 93/ Highway 1A scenic drives
b) Lake Louis
c) Gondola ride up Sulphur mountain
d) Hot springs
e) Banff Springs Hotel (didn't realize a hotel would be on the list)
f) Dinosaur Drumheller (if I can find a day to go there).