If your garden is anything like mine then it is probably too wet to get any gardening done, If so what about having a go at making some garden furniture from recycled materials such as wooden pallets. It would make an interesting design and make project.
Younger children could scale down and make model furniture.
There are ideas on this website that Ms Russell's girls found. Thank you girls.
If anyone has a go I will be happy to post any photos that you send me.