One of the best tips I have picked up so far is to buy the refillable cups at SeaWorld or Busch Gardens. We will be going to both parks. I have a few quick questions: 1. Where is the best place to buy them in the park? 2. Are there adult and child sizes? 3. Is there a choice of designs? And if so, which park has the cutest designs (in your opinion)? The reason I ask the last question is because my kids LOVE animals and I really think they will love the cups (me not so much as I will be the one carrying them, lol). I would like to find one with animals if possible.