Measuring, get those tape measures and ruler out if you have them. Play some estimating games, how long, wide, tall do you think something is, them see if your right.
If it's sunny get some jugs and water out in the garden, practise reading the scales on the side of the jug. Can you remember how many ml in a litre, how many cm in a metre and how many g in kilo gram.
Raid the cupboards (tidy up afterwards though) do the largest items always weigh the heaviest?
You can watch a little bit more of Wind in the Willows today; just until you meet Toad and see his new thing!
What sort of character is Toad? How is his house different to Mole and Rats? Would you be friends with Toad? Why?