If I ever don't know where Jake is, I can usually find him in his room - putting together a Lego set, coming up with an *awesome* new Hero Factory hero, or conducting an epic battle between Transformers and any number of evil foes.
He received a space shuttle Lego set for Christmas and disappeared to his room for a few hours. He is careful, methodical, and good at following the instructions. I can't think of a time he's ever asked for help putting together a set, except that he likes me to hunt down and hand him the pieces (He'd make a great surgeon: "Flat gray two-zer please. Red translucent one-zer." And I have to say I'm a great Lego assistant...sometimes he'll even let me stick some pieces on if I'm lucky. Either way, it's fun to see him enjoying something so much!