This is the Holiday Postcard we shall be sending

As usual I shall be printing enough out to be sent to Family and friends, it's a handy way of keeping in touch (if a little old fashioned) so I always keep a small colour printer and pack of glossy postcard size inkjet paper in the caravan for the purpose.
And yes, you can write and put the address on the back and the inks are waterproof and don't smudge.
(The better half writes them as she says I write like a Doctor)