Formal:
* Happy Holidays - This is the most common and widely accepted greeting.
* Season's Greetings - This is a more formal alternative to "Happy Holidays".
* Warmest Wishes for the Holiday Season - A longer, more elaborate option, suitable for formal correspondence or speeches.
Informal:
* Happy Holidays! - This is a casual, friendly way to say it.
* Happy Holidays to you and yours! - This emphasizes wishing happiness to the recipient's family as well.
* Wishing you a happy holiday season! - Another casual option, slightly more formal than "Happy Holidays!".
Alternative phrases:
* Merry Christmas - This is a more traditional greeting, but it might not be appropriate for everyone, especially in a multicultural setting.
* Happy Hanukkah - This is a greeting specific to the Jewish festival of Hanukkah.
* Happy Kwanzaa - This is a greeting specific to the African American festival of Kwanzaa.
Ultimately, the best way to say "Happy Holidays" is the way that feels most comfortable and appropriate to you and the person you are addressing.