Grocery store entertainment

Find that letter
Pick a letter and take turns naming items in the store that start with it. Get creative: "B" is for banana, but also for a box of cereal! 4 and up

I-Spy times three
Name three items your child can look for, like something that's bigger than his fist, something that's liquid, and something that's red. 3 and up

Banana notes
Pick up a banana and let your kid draw a picture on the skin with a pencil eraser. By the time you get home, your artist's work will magically appear -- just in time for a snack! 3 and up