My almost-3yr-old boy is in to anything with wheels, propellors, etc. I think it is pretty typical for this age to love vehicles/transportation. He has a wooden train set (i.e. Thomas) that gets tons of play. He has the Mack truck from Cars (and many of the diecast Cars as well) - he plays with them quite a bit as well. He also really likes musical instruments...but they can get pretty loud. Washable markers and stickers, safety scissors, play-doh - also big things around our house. Oh, and he's getting more in to building with legos/duplos and actually constructing things with them.
HTH!