As part of our Elk Lakes backpacking trip, we took a day trip to Petain Falls. This is a pleasant and very easy hike, about 10km return. We also included the Elk Lakes viewpoint hike on the same day which made for a longer day and much more effort.
Signal Mountain is easily done off the Skyline Trail backpacking route in Jasper National Park. I would never do it as a stand-alone peak but it could be combined with an ascent of nearby Mount Tekarra via the Signal Mountain fire road from the Maligne Canyon parking lot.