I see you are in California. I know there are water restrictions but maybe plant a garden? You could do a small one or even just one with plants that don't require a ton of water. Scavenger hunts outdoors with nature items to find or outdoor clues. Cooking lessons! Have them help cook meals and snacks once or twice a week, my two school agers LOVE to cook! Some kind of an art project like crochet or knitting.

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