Any day is a great day for Seaworld!! With all the shows Seaworld has absorbed the crowds really well anytime I have been there. It is just a great family park and it is so nice to have a day in Orlando where you aren't standing in line and are just relaxing and watching a great show. I have been most days and think any day will work although weekdays would be the best. It is just a beautiful place to go and I have found the quality of the food much better than the other parks.