The phrase "forms of human activity" is correct and usable in written English.
You can use it when referring to different kinds of activities that humans can engage in. For example, "Cultural immersion is one of the most rewarding forms of human activity."
Cowardice — your moralist's name for prudence — is endemic in politics, as in many other forms of human activity.
A. There is need in business, as in most other forms of human activity, of the great guiding intelligences.
The short-term impact of the plague may be seen in several forms of human activity during the 540s.
The noise of cars, machines and other forms of human activity could be affecting growth of wild flowers and trees, as well as animals nearby.
Although, in examples such as these, there is a tendency to isolate icons and individual symbols for examination, symbolic communication is so closely allied to all forms of human activity that it is generally and nonconsciously used and treated by most people as the most important aspect of communication in society.
They argued that in fact there is no hard and fast rule for distinguishing science from other forms of human activity, and that hence in this sense the Creationists might have a point.
Even serious-minded economists believe that leisure is the highest form of human activity.
"The underlying purpose of all construction is to serve some form of human activity," he said.
This is a genuinely extreme form of human activity, a matter of formalised violence and sculpted rage, practised in the main by those with little opportunity to pursue anything else.
Early students of crowd behaviour, struck by the resemblance to the milling of cattle before a stampede, gave this form of human activity its name.
In place of the medieval ideal of a life of penance as the highest and noblest form of human activity, the humanists looked to the struggle of creation and the attempt to exert mastery over nature.
