Hellobee Boards

I agree with @thehistoryofus, my 4 year old loves white boards, she also loves things like puzzles and ponies. And she loves takin pictures so my grandma got her a super cheap little digital camera.

My friend's 4 year old boy is obsessed with legos (like the star wars ones). I actually know several 4 year old boys who are totally into Legos. They always talk about Ninjago. I have no idea what that even is!

Four-year-old nanny-boy is super into trucks and soldiers. His Santa list is a remote-control monster truck, a nerf gun, and a snow shovel (which is my favorite part )

Four-year-old niece I'm getting craft materials. She loves to make things and draw things, so I found a bead set from Melissa & Doug that she can string wooden beads on necklace/bracelet strings. Fingers crossed it's a hit.

I would say things they can make/do more actively would be really good. Craft materials, or just more active play-things that challenge them a bit more - the remote control, or the camera (fisher-price makes a really awesome digital one for kids that my niece LOVES)