The AC in D is the 'nicest' but it's nothing too far over and above the other clubs. Definitely the newest with great tarmac views. If you've got 4 hrs to kill I'd take a walk and grab a drink in all 4 to check them out.

For snacks, at that time of day (10am-2pm) it's usually nothing more than some assorted cookies and snack mix. If you're hungry there's some decent restaurants in D.

Your drink certs will get you pretty much anything behind the bar...most of the AC's have a good selection of mid to top shelf. As mentioned above as soon as you run out of certs take your BP to the desk and kindly ask for a few more, I've never had a problem with this.