You don't have to buy the hurricane cup unless you just want one! Just ask for a regular glass. You can buy as many "Drinks of the Day" as you can handle !
You'll probably only find Mai Tai's as the "Drink of the Day" once during your cruise, if at all. My favorite is a frozen Margarita, and I was able to handle a few on "Margarita Day"!
Have a wonderful cruise, anyway!
"A truly happy person is one who can enjoy the scenery on a detour."