The first letter of each line is bolded and you can rearrange those letters (and their respective lines) to spell out two words.

Some of the bolded letters have duplicates, so make sure that each line rhymes with one of it's neighbors.

When the lines are rearranged correctly, the bolded letters spell HAPPY CHRISTMAS, but you'll need to use the very bottom line of text to get a different set of letters.

The letters that you get from the back of the lines spell out the message HAVE YOURSELF A ___. You need to fill in the blank, but you should also use the bolded text in the signature of the message.

When you combine the message and the signature, you have the message HAVE YOURSELF A ____ LITTLE CHRISTMAS, and you can fill in the blank with MERRY which is the answer.

Merry Christmas, puzzler!