You certainly have a range of ages in your family!
Well Wet n Wild is definitely a park that can entertain all ages. Your teen and preteen will love the variety of slides. Some of the newer ones, such as the Storm are unique. They have a great ride called Bombay, which is a speed slide where they actually drop you from a "ship". The Disco H2O is a wonderful family ride (not for the toddler however).
Also, they have kneeskiing and wakeboarding in the Spring and Summer months. They also have it year round on weekends if I am not mistaken.
Now for the lil one, they have a kiddie section with a mini wave pool, small slides, and those mushrooms that spill water. You could stay in this area and allow your kids to go to nearby rides if you wish.
I have been to Wet n Wild for the past several years and it just keeps getting better. And reasonable! They also allow you to bring food to the park

(just not glass).
I like Wet n Wild because of the rides, but Blizzard Beach for the atmosphere. So it really depends on what you are going for.
If you have any questions, please post...I'm going back in 3 weeks!
