From Sylvan Lake you can hike up to Harney Peak. I believe it is the highest peak East of the Rockies, if i remember correctly. Make sure you dress for weather changes, though. When we last hiked it, it was early in the season (before Memorial Day) and we got rained and hailed on. It was probably only dime sized, luckily. There was so much hail that it covered the ground like snow. We saw some ill prepared couple (her in just a short sleeved t-shirt) running down the slope as they weren't prepared for the weather.
When I was a little kid, our whole family hiked it, so it shouldn't be too strenuous for your 8 year old as long as you are all in reasonably decent shape.
When I was a little kid, our whole family hiked it, so it shouldn't be too strenuous for your 8 year old as long as you are all in reasonably decent shape.