Jennifer Perkins on Naughty Secretary Club has a great idea for spring/summer fun with your kids: freeze a bag of dinosaur toys in a block of ice and then stage a sunny-day excavation:
The hardest part about this activity was finding the room in my freezer. It works best if you freeze in batches. The plastic dinosaurs will float to the top if you try and freeze the whole tub at once. I added a little blue food coloring to my water for extra excitement... Tallulah soon discovered that water was the best tool of all for freeing her dinosaurs from their icy prison. We had chats about paleontology, melting ice, cold vs. hot - many a good lesson can be learned with this activity.