@michaelb -- we didn't go all the way back up to the forehead (having already been there in the morning). I agree, the middle part of Maple Ridge is pretty great. My daughter has done the uppermost part (up the Wampahoofus) before; my son hasn't. Next time ... on the way down Frost they were talking through how nice it would be to go back up in autumn and check out a few of the trails they haven't done yet.
And yes, their energy is virtually limitless ... a lot of the adults in our acquaintance would have been pretty well done-in by the end of this hike, but when we stopped at a sandwich place afterward I had to pretty much pry them off of the playground, and when we stopped at their grandparents' for popsicles and coffee on the way home (you can guess who got which) they were bouncing off the walls. I'm a lucky dad.