We stayed for two nights early February 2013. It truly was a memorable and unique experience from start to finish. You have to take the ferry from Fernandina on Amelia Island as no cars are permitted to cross. The car parking and ferry are all part of the deal. It takes about forty minutes crossing the sound before you disembark. Once you reach the wharf at Greyfield you are taken by golf cart to the inn (your luggage is transported separately - you have to pack light). Once inside the Inn (read beautiful mansion) you are given a brief history of the place and how the deal works. I.e. all inclusive except alcohol which you help yourself to on a "honour" system.
Be warned: some rooms have shared bathroom facilities. We had the Dungeness room at the top of the building which did have private en suite. The room was beautiful with a Fab Four poster bed.
Technophiles: THERE IS NO INTERNET, TV OR RADIO my advice: dig the freedom!
All meals are included and the food is pretty good. Lunch is sandwiches which are prepared each morning freshly for you to to either take on your hiking/ biking excursion or you eat in the garden or verandah. Tip: dining is refectory style unless you specifically want a private table which you need to tell the serving team about in advance. My advice: enjoy the company of strangers and rediscover the art of conversation. By the way: the staff are lovely and friendly. Included in the price are a full day's tour of the island by flat bed 4x4 ( not comfortable as the roads are tracks; not great if you suffer from back pain. The tour leader, Barbara, is fantastic, she is super knowledgeable and, very, very witty in a subtle way!
The scenery is just amazing. This truly is a wild, almost uninhabited island with fabulous deserted beaches that white sand and never ending.
I have nothing but excellent memories of a truly special weekend!