You would not be able to do both in one day, especially if you're a first timer and want to see everything. I would say one day for Sea World, and 1/2 day for Disc Cove (open to close - I think they close around 5?) Plus, at Discovery Cove, they only allow 1000 guests per day, so you have to book far in advance. Price for Disc Cove is $256 per person for the dolphin swim, and this includes a 7 day pass to SeaWorld. Since you are leaving on Wednesday, I don't think you'll be able to order tickets online because they won't be mailed in time. For SeaWorld, you'll probably be able to purchase tickets at your hotel, or at the Orlando Visitor's Center, or at the gates to the park. I'm not sure if they do will call where you can order the tickets in advance and just pick them up at the park? And I don't know what you can do about Disc Cove; you would probably have to call, and maybe they would do will call or send tickets to your hotel? Like others have said, go to the seaworld website and it will tell you all about the attractions and shows, list park hours, and list showtime schedules, etc. Though Discovery Cove is an awesome experience, I think you'll do better with planning a day for Sea World.