90% of that CDC recomendation is just normal vaccinations everyone should have already. The two ailments that may be of concern, Dengue fever and Chikungunya are mosquito borne and do not have vaccines but with the current record drought mosquito population should be way down. Tell them to relax and have a good time.

Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. - Mark Twain