Hi L.,
Rolls of butcher paper, usually sams club or costco have it, it is cheap for the amount you get, kids paint and brushes, roll it out in the yard and let them go at it. Great wrapping paper when they are done. I would find other art projects, clay you can bake in the oven, young kids car or plane models to put together...Things that keep his mind and hands active. If he was going to play baseball ask if he can help with keeping the paperwork during the game, who hit the ball, who made a run, ... Something new he could learn and still keep him active with a team.
Let him help with cooking at home. My son loves to cook, crack eggs, do the mixing, help read recipes, do the measuring (helps with math with out them knowing it), when my kids help me cook they really enjoy it, it creates an environment to converse a lot, they learn a lot and they start learning skills they will use their entire lifes. Young boys enjoy cooking, we pretend it is a science experiment sometimes.
Good luck,
SarahMM