An entrepreneur is planning a campsite-hotel in Romania, with a full outdoor gourmet restaurant attached, with an outdoor kitchen. There will be no cabins or other living structures, only tents and tepees. This campsite-hotel//restaurant should be attractive to people without much, if any, outdoor experience and allow them to live and eat outdoors without worrying about their safety from European brown bears. Living outdoors will be beyond the comfort level of many of the customers.
I need to enclose an area at least 50 meters by 50 meters (164 feet by 164 feet) or 0.6 acre. For many reasons, I do not consider electric fencing as an option. It needs to be a physical concrete-pole fence. Metal will rust and/or will need to be painted regularly, and wood will be too weak probably. The area contains apple trees, and vegetables will be planted inside the area. There will be at least two enclosed areas, one for sleeping and one for eating. Parts of the fence will be behind bushes, so people will not feel confined, but they will know it is there for their protection.
What height does the fence need to be, and possibly any other parameters? Not sure if spikes at the top would be of any use? Likely the fence will need to be quite strong, with concrete poles smaller distance apart then the size of a bear, so he can't pass between by breaking the weaker material between the poles.
Is this feasible at all, or will bears break through anything, and climb over any fence?
Answers started going in the wrong direction, talking about locking away smelly food. Please focus on answering the question about parameters of the fence, not suggesting other solutions. There will be just too much smelly things inside to lock away: a large outdoor kitchen, restaurant, cafe, full-size freezer, not to mention growing vegetables and keeping chicken for eggs and goats for milk and meat.
To prevent obstructing the view and looking like a prison, I want to construct this as a ha-ha wall but on a slope, here is a cross section (1):