Hi! I have a little car nut too. Here are a few activities that he enjoys (not sure if they're all educational, but they keep him busy):

We incorporate hot wheel cars into every aspect of life. When he plays with play dough he makes 'ramps' and 'spoilers' and 'covers' for his cars. Sometimes we paint his cars and then wash them back off. Now that he's started drawing he draws cars. We made Christmas ornaments yesterday and made a few shaped like cars.

Legos! And other building type materials, but especially Lego. This particular set has been lots of fun: http://www.amazon.com/LEGO-Juniors-...qid=1417716805&sr=8-1&keywords=Lego+Race We followed the directions and built it one or two times but now he just builds his own types of cars on the little bases.

We build ramps and race things a lot. When we go to the library we stop into two different car sections (non-fiction for bigger kids and the little kid car stories). We also look at car magazines and watch car tv shows sometimes. We go to car shows on the weekend (helps that DH is into this stuff too, I definitely am not). And yeah, lots of running around. smile

Honestly, it sounds like you're doing great!