Yes The weekends are busy, mainly because us locals add to all the toursists at the park. But I can reassure you that if you go right when they open, get yourself some chairs ( I like the shady area just over the wave pool to the left as you enter) and do all the rides at least onece. Escpeciially the family raft Gangplank Falls (Which gets a very long line) Then when it gets extremely busy around 1130, go to lunch and do the wave pool and lazy river and shark reef. Then rest for a while then around 4pm it starts to slow down fast. Especially on a sunday. THen you can do all the rides again.
For the past 4 years we had annuals to the water parks, so we have bee alot. But this year we just decided to build a pool instead.
George