After a long period of inactivity ( due to illness) l need to find a place where l can have an intensive training, balanced food, medical exams, etc.

A place where l could stay 24/7 during 20-30 days until regain fitness. Anywhere, Europe, America, Australia

l personally find KFC good for fitness & diet. The new hot & spicy chicken fillets r the best & will get u in the best shape of ur life (probably due to the copious amounts of steroids those chickens consume before being slaughtered. ever seen one of those chicken farms? the chickens look like arnie did in terminator 1).
in all seriousness, the place u r looking for seems like one of those tourture wards u see in dream sequences at the movies. if u need to attend one of those places clearly u do not have the self control nor the motivation to achieve maximum fitness on ur own, which means u should not even be considering it in the first place. if u really want to regain an optimal level of fitness, u will. u do not need to go to this fantasy fitness parlour to achieve what you're after.

Look at my Answer for this: http://uk.com/question/index;_ylt=ApuzXF.Zb3xUz2Xx6jVyc04gBgx.;_ylv=3?qid=20080909062138AA8rmAb

A University campus? They usually have all the things you mentioned.

The gym or some sports place

A Mental institution.
They will monitor your food intake, run numerous tests, you will have lots of free time to roam the grounds, and hallways plus run away from your psychotic roommate, and electric shock treatment is included for free.