The first SeaWorld opened in San Diego in 1964 as little more than a dolphin show and an aquarium. Also, San Antonio Aquarium features sharks, a stingray touch tank, a rainforest with hundreds of reptiles and our newest addition to the family, Kiwi the sloth! SeaWorld San Antonio is a 250-acre (100 ha) marine mammal park, oceanarium and animal theme park in the Westover Hills District of San Antonio, Texas, on the city’s west side.It is the largest of the three parks in the SeaWorld chain owned by SeaWorld … Learn More! This heart-pounding water slide features fully enclosed aqualucent tubes that deliver an electrifying sight … San Antonio… Interactive Exhibits The San Antonio Aquarium … Available Soon! San Antonio's All New Aquarium. Feel the rush of exhilarating new thrills on the ALL-NEW Tonga Twister at Aquatica San Antonio. Guests can experience the rush of Wave Breaker: The … Play Video. SeaWorld® San Antonio is a marine animal theme park featuring exhilarating rides, upbeat shows, animal encounters, and interactive exhibits for all ages. Enjoy admission to the SEA LIFE San Antonio & LEGOLAND Discovery Center San Antonio located just next door! Explore An Underwater World. SeaWorld San Antonio, the newest of the SeaWorld parks, was the largest when it opened in 1988.