By their very nature, Fire Lookouts offer spectacular views. They're also generally accessed via gently-graded roads that avoid steep, avalanche-prone terrain, and thus make great destinations for shoulder-season hikes. We've hiked (and once, drove) to a number of current and former lookout sites in the Rockies and I've collected those reports here. Most are great choices when you're wanting something easy and scenic with little to no routefinding. Many more are detailed in "Fire Lookout Hikes in the Canadian Rockies" and a map of all current lookouts in Alberta can be found here.
Active Fire Lookouts
Decommissioned Fire Lookouts