I hate to say this being a loyal marriott platinum for the last 4+ years ... but this year i used priceline to book my hotel, and got a great deal at the Westin Regina in Cancun. So i called Starwood and they comped me to Diamond, Upgraded my room by 2 levels, and gave me unlimited access to ... the > Concierge Lounge <
So maybe Marriott should consider having a lounge in either the JW or the Casa Magna