Like @@TCM4252015 mentioned, the dress codes are on the website. Looks like most of them are "Casual Elegance" with the exception of the Cafes - Market Cafe, Coco Cafe, and Barefoot Grill - being a bit more casual.
Casual Elegance
Sneakers/tennis shoes or sandals and dress shirts with short sleeves or shirts are required. Long pants are required for men. No sleeveless shirts or flip-flops allowed. http://www.nowresorts.com/sapphire/gourmet-dining
Oh! @@jh0510038, I'm just a couple weeks after you! You'll have to let us know how everything goes!