Ok, my two are different ages but no asd. I plan the day and share this with them beforehand so they know what is coming up.
On rainy days we:
Puzzles, colouring, make collages, paint, play dough, Lego, role playing, picnics indoors, TV, pretend we're in a cinema and watch a film, read, make a book, card for somebody, play with cars, dinosaurs,wash toys.
Ok weather: parks, walks, beach but it's a drive, picnics, gardening, sports day, nature trail, treasure hunts, paddling pool, chalking, kite flying, swimming pool
I tell the kids quite clearly who is leading with a particular activity and there's an alternative if they're not keen but we take it in turns to choose. I wrote it on a simple calendar so they can see who is getting my time and when they are doing their chosen activity. Keeps me sane too.
How did you cope in lockdown?