A nice walk (not too much "hike") with waterfall payoff at the end is
Cat Creek, down in south K-Country. Could take the Highwood Pass home, if you go down Cowboy Trail and head west to this hike at Longview - stop off and do a hike or two somewhere along the Pass, if you started your day good and early - maybe
Picklejar? What else in that area? Galatea, Lillian Lake, Watridge Lake from the Mt Shark lot, Old Baldy, Barrier Lake lookout, Jewell Falls, Rawson Lake, Ptarmigan Cirque, Pocaterra Cirque, Mt Kidd lookout, etc.
Troll Falls is a super easy hike to the falls, but if you go up and around/up top over the first falls where everyone heads to, there's some beautiful hiking back in there, if you follow the trail. More creek and waterfalls, and you can come back down on the other side of the creek, and ford it to walk back the way you came, to the parking lot. Some real goat trail in places - we did it with dogs, and it was a bit dicey in a couple of areas with the mutts, so I wouldn't take them if we decided to do it again.