First week of June isn't to bad since most kids are finishing up school. I would suggest doing Seaworld, Discovery Cove, Aquatica and Busch Gardens all on a weekday. Weekdays will always be less crowded. If you have to do a weekend, I would do Discovery Cove on the weekend day since Discovery Cove is an exclusive experience that only allows 1000 people in the park all day so crowd size will not be an issue on the weekend. I would also consider Aquatica on the weekend as well since it will be less crowded than Seaworld or Busch Gardens.