Chakanaab coupon

Our family will be visiting Cozumel at the end of March. We are planning on visiting Chakanaab. I have gone online to print the coupon, however it states that it expires January 31, 2018. I have emailed them but haven't gotten any response. Does anyone know how strict they are about the coupons? It seems like there has always been one available online (at least for the last 2 years or so that I am aware of). It's only $10 bucks, but I'd still like to save it if I can! Thanks for any advice/experience.

I went on February 1st and used the coupon that expired January 31st. They didn't seem to look too closely at the date.

Note, they needed a piece of ID to redeem the coupon.

Thanks for the help! Just heard back from Chakanaab and they updated the coupon online until March 31