The centerpiece of this well-appointed and popular aquarium is the four-story Giant Ocean Tank, which contains sea turtles, sharks, hundreds of colorful reef fishes, and 200,000 gallons of water—a live webcam offers a fun sneak peek. A wide ramp travels up and around the tank with exhibits tucked off in every direction. Other sea creatures include seahorses the size of grapes. Seals and sea lions frolic in the open-air marine mammal center, and at the ray touch tank visitors can pet the exhibit’s leathery-skinned inhabitants. More than 80 penguins greet visitors just inside the front entrance. The facility is big enough to comfortably accommodate the masses of school groups that descend upon it periodically throughout the year. Even if you don’t venture inside, you can visit the Atlantic harbor seals, whose tank is outside next to the front doors.