If you find yourself at the Overlook Hike, then you are right where you need to be to find the Pine Creek trail. This trail is NOT clearly marked in any way. The trail head is located in the parking lot right as you exit the tunnel.
There is a sign to follow the path under the road/bridge. You will be able to see somewhat of a trail. Follow that down into the slot canyon. Small children will need help down but I think they would have fun exploring the canyon.
Once you are down, head to the right. The trail is passible for about 15 minutes, after that you really need some equipment and ropes to go any further, but if you have a short amount of time and want to see some pretty slot canyons, this is a great little hike.