Wow - a whole week at SSR - they're going to LOVE it!
We sent my parents to Vero for their 40th anniversary. For their 45th, we gave them a choice, and they went back to Vero! They really love it there!
I called ahead and purchased some gift certificates from Captain Hiram's and from the Patio Restaurant, then also bought some Disney Dollars. I put them all in a "Happy Anniversry" card and sent it to the front desk a few days in advance of their arrival, with a request that it be given to them when they checked in. Then, we also had some wine and a cheese & fruit platter waiting for them in their room. My Uncles paid for that...
Vero was more than accomodating!
It all worked out great, except that I was expecting them to use the Disney Dollars at either Shutter's or Sonya's, and my Mom ended up spending them on t-shirts, etc. for herself in the gift shop!

Oh well - my Dad probably appreciated it, too!
Hope your parents have a great time!