Whirl,
What you mentioned isn't quite what's being offered in Cancun. For your bonus week and $672, you get a studio unit at the Park Royal at any time but high season with all meals and drinks, a ferry to Isla Mujeres with lunch, a night at Senor Frogs, and movie tickets. The airfare is extra. The hotel is oceanfront but only presidential units (2 bedrooms) face the ocean. You probably won't get a balcony either. Most of the ambassador units (1 bedroom) don't have balconies so I doubt that most studios do. Also, I'm pretty sure you must pay for all 7 days whether you're planning to stay 7 days or not. My son's friend left early when we stayed there in 2004 and we had to pay for all 7 days.
Okay, having thrown out all of the negatives first, I have to say, I don't think it's a bad deal. I like the location of this hotel better than any other place on the island - not to near the point where it's congested and not too far down Avenida Kulkulcan. We don't stay in the room that much so the view isn't that important. And we pay $300 apiece to USA3000 or use frequent flier miles for our tickets. If I can get more vacation time off from work, I'll use it.