Trick-or-Treaters walk on the Santa Monica Pieruring Santa Monica Pier Aquarium's Frightening Fishy Fest Celebrating Halloween and Dia de los Muertos on Sunday, October 27, 2013. The Santa Monica Pier Aquarium is Heal the Bay’s public marine-education center located beach-level, just below the Carousel at the world famous Santa Monica Pier.The Santa Monica Pier Aquarium’s vision is to inspire understanding and conservation of the Santa Monica Bay and its watersheds through hands-on education, environmental stewardship and discovery. To that end, visitors find engaging education programs, activities and special events dedicated to pollution prevention, marine conservation, biodiversity and environmental education.