Second question on trek

Refering back to the fact that my treks were in winter, and that one of my captures was of a man shoveling snow, I wonder what I could catch now that would be indicative of the changing season? How about kids on the playground, or a lawnmower, or several bicyclists riding by on their venture? I think a unique feature of these Treks is that they are not only capture the environment, but the season that that environment is experiencing. How neat is that?