While Sandcastle probably isn't the best waterpark in the world, I've always appreciated it's brevity and conciseness. It knows what it is...doesn't try to be more than that, and lets you take advantage of most of it's best offerings quickly and then getting you back to real life. It's a waterpark that doesn't waste your time, forcing you to wander all over a huge map and wait in long lines. You're in, out and back to life.
Speaking of which, time to get back to reading Perks of Being a Wall Flower. The school year starts soon and it's not going to read itself.