A Quick Question

This year I'm going to try to have some time each day for Evan and Amy to play one on one with Emily while I teach the other big kid. I was wondering if any of you have some good ideas for things to do with a preschooler (2-3 years old). I'm thinking things like playdough, blocks, and puzzles. Please leave a comment if you have any ideas. I'm hoping to collect a bunch to rotate through. Thanks!