First of all Zihua is highly enjoyable if you intend to kick back, enjoy fresh, unpretentious seafood, and warm ocean water. From the perspective of Cancun, it's Night&Day. Just what I expected. Loved it.
We stayed at Club Intrawest, swapping a timeshare, since we had read good reviews. And we were not surprised nor disappointed.
Great beach views and access. To an extent, secluded at edge of the beach. Rock formation allows for enjoyable snorkeling.
Food selection was limited, but tasty. Restaurant with creative take on Northamerican fare, with Mexican ingredients.
One drawback is lack of true kitchen, since electric grills don't cut it if cooking more sophisticated fare.
Not for party-people. Not for eaters of volume. Not for people who avoid some physical activity (the stairs are notorious).
Would definitively choose Zihua over Ixtapa on next trip, and again Club Intrawest.
Although make sure you do buy Insect Repelent...mosquitoes are ruthless.