Some wonderful ideas for math and science here, but keep in mind some of the language activities are for first graders so wouldn't be appropriate for preschoolers. Incorporating Reggio methods in a "traditional" school setting
If you have a class pet, set up an science investigation to learn more about it. Pets move which means students can observe them! Add some books, charts, vote on the name, and journals to the science table to take your pet investigation to the next level!