3 I did this year: All require some uphill work.
Easiest: Picklejar. Nice fishing, nice view, short, maybe 4 km each way, Very accessible. Killer headwall at the end, but not too big.
Middle: Tombstone Lake (lower one). Interesting country, wild. Hike not that difficult. Advantage is you get to stop at and fish Elbow Lake on the way (1.5 km from start). Longer but really no more difficult than Picklejar. about 9 km each way. Trail easy to follow. Not a ton of vertical. half of it is right at the start, the other half approaching tombstone lake. The 6 km in the middle are flat.
More challenging: Loomis Lake. about 13 km each way, a number of river crossings (will need to bring footwear you can get wet or waders). Note: Lake was half covered with ice in July. LOL
The starts of all three are probably within 10 miles of eachother on highway 40
Check
www.hikealberta.com for detailed descriptions of lots of hikes.