Everything you do can be a learning experience. Going up and down stairs for instance. My children and I count in English going down and in Spanish going up. We cook together and talk about the measurements and often I will take a 1/4 cup when we need 2 cups of something so that we can figure out how much we need and then count each 1/4 cup that goes in the bowl. The gather ingredients and we count them. We talk about the colors, how they taste separately and how they taste together. We talk about how the vegatable oil floats on the water. We talk about fire safety.
I've done this since my oldest could stand in a chair next to the island. Not sure how much they understand at first, but they get it eventually. We sing songs in the tub. Write the ABC's on the walls with Fun Foam for the tub.
We count their m&m's, talk about how many of each color and make graphs.
We talk about the colors of our clothes when we get dressed.
We go exploring around the neighborhood looking for bugs, animals, and plants. (I even got my oldest a five dollar camera when she was about three to take pictures...you wouldn't believe the pictures she took) We get emails from the Huntley Park District and McHenry Country Conservation program about events like walking through the woods, fishing programs and crafts.
We go to the library and get the pick-up crafts, play on the computers they have there. My oldest learned to use a mouse at the library when she was about 2 1/2...and now they go on Starfall.com and PBSkids.com to play games involving the ABC's and reading.
We get DVD's from the library like Signing Time where they learn sign language. We get LeapFrog DVD's and other learning movies.
I go on-line and google pre-school activities to do from home, free pre-school materials, and so on....My mother-in-law has found numerous activity books that we use at home at discount stores like Village Discount in Elgin. The latest was a Kindergarten Workbook that had a CD in it with computer games. The two year old I watch and my four year old play it every day for an hour.
We play memory games, put together puzzles, play Candy Land, the LadyBug Game, Yahtzee, Go Fish, and Crazy Eights. I just lay the cards on the floor and help them decide what plays they will make. They both know all their colors and even the two year old knows most of her numbers.
Everything you do can be a learning experience. Just think about things as you go through the day.