DS2 got a Bruder trash truck for Christmas, adding to some of our other Bruders. The boy loves trucks.
You said you have a bike, but a balance bike is great at that age.
Child sized rake, shovel, wheelbarrow. The For Small Hands site has great ideas for practical life items for 3 yo. My kids have really enjoyed those items around that age.
A sit on excavator toy? We've had one for yrs and it still gets a lot of play. http://www.amazon.com/Big-Dig-Ride-o...e+on+excavator
DD and DS1 got DS2 a playdoh set for his bday. He's very into play doh right now.
Board games: Busytown, Hi Ho Cherry-Oh, Eeboo's Life on Earth matching game, Haba Orchard, Zingo
Mama to DS-2004
DD-2006
and a new addition-ds born march 2010