Nothing close to Fairmont, areas are going to be at least 1/2 drive.
Forster is west of Radium, paradise west of invermere.
Toby Creek Adventures for guides.
if you have never ridden the area before and are not riding with someone who has I would stick to the main areas, forster and paradise mine. the other areas can be hard to find if you have never been. not really any signage.