Fantastic, go hungry. The food is very very good and the service is supurb. We did it last year and were very very happy, we wished we had not eaten lunch. The meats were very good, they were keen to tel you if it was not exaclty as you like, for example, the meat they took around was too rare or too salty they would do some seperatelty to match your tastes.
The salad bar is also fantastic, not only salalds, but also things such as asparagus and meats are on it, well above usaul buffet fare, and very very fresh.
Take your time as you certainly want dessert, they have a tray with the desserts on so you can see what they and will explain them all to you. The dessert you are served is fresh from the kitchen though.
There are also some excellent South American wine. Allow time for this meal, take your time and enjoy it.
For your birthday they will send a free meal voucher.