I can't say about Williamsburg, but the one in Tampa was awesome. We'd stroll in, grab 3 bottles of water and then off to a ride. Stop in, grab some fruit or a cookie and a drink, then go ride. We took 6 bottles of water with us when we left the park. We also purchased the refillable bottles, as we were staying 3 days but only did the meal plan for 1 to start. (We weren't sure if we would like the meal plan, but we did end up purchasing it for the next 2 days as well.) Those came in handy as well, and we could use our PH discount on the refills (making less than $1 each of soda/lemonade, or 1.50 each for the icees). I'd pour the soda/lemonade out of the paper cups into the hard plastic bottles, since they had handles and were easier to carry!
We did the giraffe safari thing (extra cost) and it was worth the money. Petting the giraffes was amazing! DH did the front of the line pass one day, and it worked really well for him.