Visual Schedule: Photos from first day of school of class at different centers, activities. Order photos as, like, a Christmas card/birth announcement layout with text being the name of the activity. NOT THIS Year for me (but Later?).
If you need a super simple volcano recipe, it doesn't get much easier than this. Prep is about 3 minutes, and there is no clean up necessary. Easy Baking Soda and Vinegar Volcano Eruption for Kids by Preschool Inspirations