Hello,
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Thank you very much for the gift.
Merry Christmas and happy new year.
すてきなプレゼント、本当にありがとうございます。
楽しいクリスマスと、良い新年をお迎えください。
(If you don't mind... I added すてきな, which means nice/fantastic etc. I just thought プレゼント、本当にありがとうございます would sound a bit blunt.)
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You might have already noticed, but... just in case...
http://www.japanforum.com/forum/site...-recovery.html