Once upon a time, swimming with dolphins was something most of us could only dream of. Realizing that, SeaWorld Orlando opened Discovery Cove in 2000 to offer everyone that once-in-a-lifetime opportunity, but there’s so much more to explore. The park is never too busy, as attendance each day is limited. Discovery Cove is open from 9:00 am until 5:00 pm, and check-in and sign-ups for the Dolphin Swim begin at 7:15 am.