Without the constant demands of programming and organising the next days lessons teachers can unwind and relax, but also revitalise and discover new learning experiences.
I don't think teachers are ever really off duty. Everywhere you go, and everything you see, hear, or learn is constantly evaluated to its value in providing learning experiences for the students in your care.
Now without an avalanche of details demanding your attention is the time to expand your vision and look at the big picture. Inspire yourself with some Education TED Talks. Start to grow your Professional Learning Network with Facebook, Twitter, Google+, or sector based networks like Maang or Yammer.
If you have school aged children or grandchildren or nieces and nephews yourself you also have some handy guinea pigs. Take the children and visit your local tourist attractions, museums, parks, national parks, rivers and beaches. How can some of these fit into your units for this year?
Do some cooking with the your kids. Can any of these recipes be adapted to work with a class? Do some science experiments with the kids from CSIRO's Do-it-yourself Science. How can some of these fit in your unit?
Try out some of these free web tools yourself and even better get the kids to try them out so you find out any difficulties and the possibilities.
What wildlife is endemic to your area? Use books, websites such as Earthwatch, and apps to find out. Use the ABC's Scribbly Gum to find out what is happening in nature this month.
Take photographs that might be useful educationally and share them on Flickr. Investigate Flickr Creative Commons for copyright free images to use in your teaching resources. Start a set or group on Flickr on a particular theme and you may be on the way to creating a worldwide resource like this one on Australian Rainforest Plants.
Research the local Aboriginal history so that you will be able to fit it into all your subjects at school. Check the library, internet, local museum and local Aboriginal organisations for resources.
Go to the local bookshop and/or library and read some children's books. The kids can borrow or buy at the same time.
At the end of the holiday you will be bursting with ideas and the kids will think they have had a great time too.