Just received an email from MP Partner Hilton for the following promo:

At the Hilton Family of Hotels, you’re rewarded during your visits and after. You’ll earn double Mileage Plus® miles when you register and stay at participating Hilton Family hotels around the world between April 1, 2009 and June 30, 2009.

The only problem is when I go to register, it asks for my PIN... Seems strange to me. I don't generally give that information out unless I'm logging onto a site. Shouldn't my Hhilton number be enough to register?

Your thoughts?

DD