Rules have been relaxed a little from what they used to be. Formerly, resort casual required men to wear a collared golf shirt, now, so long as your tee shirt is a solid color without printing, it’s acceptable.
Generally, cargo shorts are fine as are sneakers/running shoes. No flip flops and I believe for men, no sandals. Of course, no torn or frayed clothing.
Sun dresses are perfectly acceptable, they’re dresses. On the other end, business casual is fine as are suits and cocktail dresses.
When I eat at any of the signatures, I wear cargo shorts and a golf shirt or a solid colored pocket tee shirt and everything is fine.