If you love the sea life, then the Chicago attractions that you should visit is the Shedd Aquarium.  This will give you an idea of what an underwater life is in terms of sea animals and water flora.  You will see all forms of sea animals as well as the Caribbean Reef, which is the main attraction for people who would like to see this majestic underwater life with the combination of both small and great manta rays, sharks and turtles that are living together in harmony with each other.  Going to this place is something that would keep you calm and have an enjoyable trip.