Welcome to the great outdoors! With children that means active exploring, piling sticks, looking for signs of life and having fun whilst allowing the Holy Spirit to lead the activities. Young people (and the young-at-heart) can be encouraged to be mindful, to share their experiences with each other, and perhaps to create an artwork with found materials.
If you are leading a trail around the churchyard, whether to look at memorials or nature (or both), tread lightly. Watch and wait as the creatures in your outside space make themselves known. Listen and watch for the presence of God in the world around you.
Resources
CMC Simply Outside leaflet (Mini Pilgrimage)
Planting a seed activity (Muddy Church)
Top Tips for Walking with Children