When I retired from teaching I volunteered as an education ranger with the Forestry Commission. I did lots of fun stuff like shelter building, minibeast hunting, pond dipping etc. Best of all, no planning or marking!
Unfortunately the FC no longer have an education team so that ended after 5 years.
Together with my late husband, I volunteered at my local museum. He demonstrated rope making and I stewarded the air raid shelter. I'm still doing it. I enjoy meeting our visitors, many of whom share fascinating stories of their wartime childhood.
This weekend I have volunteered to be a finds processor for an archaeology team that is digging test pits around our local area. It's surprising what opportunities are out there once you start looking.
Almost forgot, thanks to my time volunteering for the FC I became friends with two other women of a certain age. We meet up weekly to work in the forest. Repairing fencing, clearing brash, surveying reptile populations.........and eating cake, drinking tea and doing a fair bit of nattering too.
Hope you find something you enjoy!