We have been to the DoubleTree Grand Key Resort for two nights last week. The hotel was quite beautiful and had a very caribbean touch. We liked it.
As a gold member we booked a balcony room and got ... a balcony room overlooking the parking lot... Great view...

But the room was nice.
We did not have to pay the 10 US$ parking fee, don't know if they wave it for all guests or only for the HHonors members (with or without status ? )
Can't say if the breakfast is free to Hhonors Gold/Diamond members as our booked rate included it already but we got 4 cookies on check-in as another guy checking in didn't want his... Stupid one!

We took them!
The free hotelshuttle to the center and the beaches runs hourly from 8am to late (Don't remember the last tour)
All in all it was very nice and if you got further questions, please ask.