Getting to know the park is no problem. At first it seems complicated, but you'll figure it out, plus they have a map in the park to look at. A good reason to arrive early is a line forms at the snorkle station where you get your gear. If you go early, you won't wait in any line, and you have your choice of the beach chairs and where you want to sit.
If you have kids, most go near the beach that leads to the lazy river. This beach is between the coral reef lagoon, and the lazy river entrance.
If you want quiet, you go towards the end of the park where they have the dolphin swims.
If you get an early swim time, do lunch at 11am to beat the crowd. Otherwise go to lunch at 2pm.