Hi Julie,
Yes, there are already two travellers booked on this date (1 man/1 woman) with ages from mid-50s to early-60s.
The flight - stressing that the following is provisional, subject to change and would be confirmed in your final documentation, the flight is a daytime flight arriving in Calgary mid-afternoon on Day1 for your transfer to Banff.
In terms of the walking aspect - this is a new tour for 2015 and I've been advised that it's on par with what you would have experienced on the Canada & New England tour.
Hope all of this helps.
Kindest regards,
Julia