Answer: It's Chee, not Xi
You've arrived here because you used the incorrect spelling of Chee. Maybe you were given the name of the site verbally and you've taken a perfectly logical guess.
Anyway, it's Hawaii Chee and you've found their site!
Just click Here for the Hawaii Chee main page.
Xi is the fourteenth letter of the Greek alphabet and a really useful word in Scrabble.
Chee comes from the word Cheehoo, Hawaiian slang originating from Samoan culture. It's an expression celebrating something.