So, uh, this is a number you call if you get an AMEX platinum card to get SPG gold. The card has a big annual fee but gives you status in a ton of programs. Apparently, it's not automatic and you have to call the program to tell them. Anyway, here is the info on the SPG number and code. I'm already SPG gold but if you aren't I am pretty sure you just call this number, give them the code & your SPG number, if the ask tell them you have a amex platinum card but hopefully they won't even ask, and you are a SPG gold member.
Starwood Preferred Guest is the award-winning frequent guest program uniting over 850 hotels and resorts worldwide in over 95 countries including the renowned brands of Westin®, Sheraton®, Four Points® by Sheraton, St. Regis®, The Luxury Collection®,
W Hotels® and Le Meridien®.
>Call 1-888-625-4990 and mention code SN
Without having to meet any frequent stay minimums or requirements,
Platinum Card® members are entitled to complimentary Gold Preferred status in Starwood Preferred Guest.1 If you are already a member, you can receive a complimentary upgrade to the Gold Preferred level.
As a Gold Preferred Guest you will:
• Earn a 50% bonus (a total of three StarpointsSM) for every eligible U.S. dollar you spend at any Starwood Preferred Guest hotel
• Receive a complimentary upgrade to a Preferred Room when available at check-in2, and 4 p.m. late checkout3