C.L.
A wooden train set. It was one of the best investments we made for our two boys. We found you get what you pay for in terms of the track. The more expensive track fits together much better and is easier to take apart and re-design. We used Brio track and the Thomas engines. He's a little young--obviously you will have to build the layouts and stuff for him, but by age 4 our older son was a track building wizard. It's a great item to add to gradually. We always had ideas for Santa and the grandparents for Xmas, birthdays, etc. Thomas engines were also used as potty training rewards at our house. When our younger son was born we gave our older son Donald and Douglas, the brother engines, as a gift for getting a new baby brother. Don't make a permanent layout by gluing the track pieces together. Taking it apart and making new layouts is half the fun and provides a lot of educational benefit.