Toys and Treats
You're not doing your cat any favors by taking her to Cabo San Lucas. She won't be taking advantage of the sun and surf -- she'll just be hanging out in an unfamiliar hotel room.
Since your cat is just tagging along (probably unwillingly) on your vacation, the least you can do to keep her happy is to bring along something fun for her. A few favorite toys will remind her of home and keep her occupied while you're outside sun worshipping.
The same thing goes for treats. Reward your cat for being such a patient travel companion with a few of her favorite salmon-flavored nuggets, or a ball filled with catnip.