Art and craft
Go on a bug hunt and make a minibeast hotel.
Make fake snow: https://www.thebestideasforkids.com/fake-snow/
Go to www.thebestideasforkids.com for lots of other craft ideas including: making saltdough, button art, leaf art, salt painting and suncatchers.
Other things you could make are: sponge stampers (or potato prints), bookmarks, friendship bracelets, paper boats and aeroplanes, pet rocks, bird feeder, puppets, recycled modelling, paint a water picture, make handprint/footprint animals, design a logo, scavenger hunts (there are lots of types of these including rainbow and a-z), complete the lego challenges and make 'I am thankful for' jars.