Since the weather is so nice here, the kids have been wanting to spend every minute outside that they can. We have been doing quite a bit of work on the yard this year, including building a safe place for Baby B to play. As part of that, we made an outdoor chalkboard. We simply bought a piece of 4x4 birch, painted it with several layers of chalkboard paint and hung it on the fence.
The kids are loving it. It's big enough they both can use it, and whether it is enjoyment in the act of writing vertically or the act of writing outside, Miss M is getting great writing practice!