I no longer put my shop on vacation mode for SEO reasons. It is SO difficult to be found online that when you finally do, and the customer sees nothing (which is what they will see when you go on vacation mode) but a "you're away" message, it seems counterproductive (to me, anyway).
Instead, I post my Vacation Mode BANNER which has my shop sign on 2/3 of the pic and the "vacation message" on 1/3 of the pic. My shop remains open - they can browse - but nothing ships until I get back. On my last trip this past July, I had LOTS of VIEWS and 4 sales while I was away. Customers didn't complain and all understood that nothing would be shipped until I got back.
Have fun on your break!