There is a path along the Umia river that starts in Riadumia and goes until Pontearnelas. Along the way there is a bridge where you can find a playground.
The route is a bit long (6 km); I only did the first part. This stretch has strikingly beautiful landscape, and you can learn more about local history and the importance of this particular monument. The experience can be very rewarding.
The city organizes a few hiking trips the last saturday of every month.
I've attached a few pictures from the beginning of spring to show you the beauty of the place.