As Mike said, you don't need to stay at WannaDive sites, you only need to use them as your Dive Op. When I was there, the first week I was at Eden Beach, and used WannaDive, the second week, I stayed at Golden Reef Inn, where Mike stayed, and Liz also uses WannaDive for the dive op.
I think the Windsock site is open to the pubic during the day, and often has a WannaDive Rep there. They have both Air and Nitrox tanks there for pickup/return. It is locked after hours, but divers who use WannaDive has special access 24/7.
I spend several hours on my last day (no-dive day) there relaxing and it very quite, and not at all crowded. I think most don't know about it.
As for the "beach", and Mike said, it's not really on the "beach". It's elevated - similiar to Bachelor's Beach, with stairs down to the water. The elevated area is very nice, done is sand with loungers and tables/chairs under palpapa's.
As far as the lodging across the road, I don't have any knowledge about that other than to say it is linked from WannaDive's website.
