Hello, Susan!
A good idea would be to place a popup message on your pages that alerts visitors immediately that the store is on vacation. Then turn off the ability to order anything. You can turn it off, by removing your payment processor and republishing your site. If someone attempts to make a purchase during while it's turned off. They will receive a message that says the store is currently not accepting payments at this time.
As for the popup window. You can use an app for that right in our app center. Check out the popup app by Lifter Apps here: http://www.weebly.com/app-center/pop-up-window
Add the app to your site.
You can then create your own custom popup image/message via Canva. This works hand in hand with the popup app.
The following instructions will guide you on creating your custom popup image. https://popup2.lifterapps.com/tutorials/canva
Once that image is saved. Upload it to the popup app. You can then test it on your site.
Note: The popup app also allows you to integrate an email signup form. You could collect emails from visitors. Then alert them when the store is back open.
You can also create your popup image/message using another program such as Photoshop. This is entirely up to you.
