Hyatt Ziva offers swimming with dolphins for an additional cost. You can always make reservations at the resort when arriving.
Wave runner rentals are available for an additional cost and are easily accessible through Hyatt Ziva Resort. They are located in between Hyatt Ziva and Fiesta Americana Resort, north of resort.
The flea market is only 0.5 miles from the hotel (~10 min walk) from Hyatt Ziva.
The Forum at Seas is location in the heart of Cancun's Nightlife. Several restaurants, bars, clubs, and shopping centers are all within walking distance from Hyatt Ziva. Only 0.4 mile walk (~8 minutes from the Resort).
La Isla is located about 2.8 miles from the Resort (~11 min drive). Resort offers taxi services. La Isla is a shopping center with several stores, restaurants, entertainment, and an aquarium. Feel free to check out the websites to see what they have to offer.