Frohe Weihnachten!

Ich hoffe, euch hat's Spaß gemacht, und wünsche euch frohe Weihnachten!
I hope it's been fun and I wish you a merry Christmas!
Captions 71-72, Frohe Weihnachten: der Christbaum

Beyond "merry Christmas" there are a number of other ways to give season's greetings as well, for instance your Christmas could be schön:

Dann wünsch' ich euch schöne Weihnachten.
In which case I wish you a wonderful Christmas.
Caption 84, Weihnachtsinterviews: Cettina in Linkenheim

Let's not neglect the period before Christmas, which in German is the same word as in English:

Der Advent, das ist die Zeit vor Weihnachten.
Advent, that is the time before Christmas.
Caption 3, Weihnachtsmärkte: mit Eva

And if we're going to make it through all the Christmas shopping, we'd better have some Stollen to see us through:

Das ist der Christstollen. Der wird auch Weihnachtsstollen genannt.
This is the Christstollen. It is also called Christmas stollen [fruit cake].
Captions 22-23, Weihnachtsessen: mit Eva

If you don't have your Christmas tree yet, you might have to go diving for one!

Nasse Weihnachten: Der Tannenbaum steht fast vier Meter tief unter Wasser.
Wet Christmas: The Christmas tree stands nearly four meters deep under water.
Caption 1, Weihnachten geht baden: Tannenbaum unter Wasser

Further Learning:

Do a search on Yabla German for typical Christmas words and get into the Christmas spirit while improving your German at the same time. Happy holidays!