Stone Activities for Kids - Happy Hooligans. *Always pack a sharpy and you can draw on rocks "on the go." Or when the kiddos find the ones they wish to use, just whip out the marker and have your kids help draw on the rocks.
Dinosaur week: Fun & Simple dinosaur activity for kids! Maybe for older kids give each shape a numerical value and have them add how much their dino is worth. Can use with class to compare/contrast amounts, etc.