I used to work at the Columbia icefield center, definitely one of my favorite drives, too bad when i worked there i drove an '86 camry
Still try to make the drive once a year though.
I'd recommend spending the $36 (at least that's what it used to be) and take a bus tour of the glacier in the summer , also if it's getting late and you need a rest and haven't made reservations if you're nice to the front desk staff at the hotel there you can usually talk them down to a reasonable rate for the hotel if it's not busy.