to the op: have you started your peds rotation yet or will you be starting it soon?
heres my tips:
make sure to get down to their level and to explain things in words they will understand.
blood pressures are always hugging arms, or checking how big muscles are.
iv's are silly straws that are giving their hand a drink
(normally what i tell kids after tonsils out since they are too sore to drink po)
always carry some special bandaids, its amazing how a bandaid of spiderman or pooh bear makes everything better.
as another poster mentioned, its *great* to let kids help out. i usually would bring in an extra stethoscope when i worked hospital and let the kids listen to me while i listened to them. great distraction.
just a few off the top of my head...