Go to their website.
At the bottom of the website, you will see the words "Contact us."
When you click on it, it will send you directly to the e-mail option.
I have sent an e-mail the last two years, because I have had some incredible experiences that I wanted to make sure were passed along to the staff and their managers.
I not only received a confirmation regarding my e-mail, about a week later I received a phone call from a CM thanking me for all my responses.