Salad spinner as dolly thrill ride
Kim's hack will bring out the mad scientist in your kid:
Got one of those big salad spinners with a clear bowl and an easy-to-use spinning mechanism? Show your little tike how to put one of his favorite dolls in there and spin it around. This impromptu activity produced about a half hour of non-stop laughter with my two year-old, as he spun his stuffed animal and some play people round and round, peering at them through the bowl.
I can vouch for this hack myself. My kids have spent hours spinning various things in the salad spinner, including marbles, plastic animals, and dolls. I love my OXO salad spinner -- it operates using a pump in the lid, and has a squishy rubber "brake" that is just as fun for the kids to use. The large, plastic bowl makes a great Barbie swimming pool, too.