I believe that the answer you are looking for can be found in Chapter 15. In that chapter, the creature is describing what his life was like as he was living in the shed and observing all that went on around him in the world. He was learning about the world by observation.
The creature says that for most of the summer his "chief delights" were things from nature. He loved to look at the flowers and the birds and things like that. The relevant quote is
But my chief delights were the sight of the flowers, the birds, and all the gay apparel of summer
Once it got to be fall, he could no longer look at these things and he started observing the people more.
In the book Frankenstein the creature spends his time observing the natural elements surrounding him. He also begins to learn about books and teaches himself to read. Once he has learned to read he begins reading every book that he can get his hands on. He enjoys learning and reading from mater writers.
The other thing that the creature enjoys is watching the family of the blind man. He gets to know them almost intimately from his observations. The creature begins to develop a desire to be accepted and part of the family as he identifies in himself that he needs to have social interaction with humans in a positive way.