The opening chapter uses a lot of symbolism to introduce the cultural contrasts between the warm island life of Barbados and the cold Puritan society of Connecticut, where religion controlled everything. For example, her colorful dresses brought from Barbados must be put away and are replaced with the drab colored clothing that is standard in Wethersfield. Before coming to America, she swam in the warm Caribbean waters; now she finds that the Connecticut waters are as chilling as the society they surround. The New England setting contrasts with Kit's former life and immediately introduces conflict into the story.
In The Witch of Blackbird Pond Hannah is described as a kind and harmless woman who lives in the sunny meadows. The setting where Hannah lives (sunny meadows) symbolizes and reaffirms her pleasant and harmless nature. Normally the reader would expect a witch to live in the deep dark shadowy forest or swamp.
I would continue to focus on symbolism that illuminates the contrast between light and dark, freedom and oppression, and the Kit's new life and her old life. The author is trying to make some very strong statements about the nature of the puritan lifestyle and how it affected anyone who was different or fell outside of the accepted societal norms.