It depends on the type of park. For example, if it is for the purpose of visiting the animals for children and playing with them along with some entertainment, then you will need a large number of employees, but otherwise, the operating price will not increase, but the capital may be high.
However, if it is an amusement park with games and activities for all ages and events, you will need a very large area with an easily accessible location. Moreover, you will need a huge advertising, which will increase the capital in a large and permanent way.
The feasibility study in this case is high because it contains areas and specialized studies, but of course, it is possible if you are ready to enter this field.