We just got back from 4 nights. My husband and I used our 2 free nights (each) from our Hyatt Signature Visa bonus. For that purpose, it was great! However, if I had paid the $420+ per night, I'm not sure I would have liked it very much. Overall, the resort is beautiful, the room was nice and we had a nice ocean view, the drinks are free flowing, service is great...but the food was disappointing. IF I was paying for a trip to Cabo, I would prefer to stay at a regular hotel and go out to dinner at a nice restaurant. But for using award nights, it's great!!!
In answer to the question about a couple without kids...that's us! There weren't many kids there and they didn't bother us for the most part, except at dinner one night at the steak house and they were loud there but that's really the adults' fault.
If you are considering going...I have a lengthy review of the resort and the food on my blog...
http://cheaptrickstotravel.com/hyatt...-free-flights/