I think Jasper town would be too far for a day trip. You could substitute a triangle trip down to Radium And up through Kootenay National Park. Also the drive west through Glacier N P to Revelstoke is quite scenic. Combined with the Lake Louise area and Yoho N P there would be lots to see.
It won't be ideal as Highway 1 is going to be very busy with lots of trucks combined with vacationers. Speed limit in the National Parks is 90 Km or about 55mph .
I think the David Thompson Resort suggestion is worth considering.
