We were there last week and my 21 month old did everything except the Shamu express (roller coaster), the flying fiddler and the high rise playground.
Carousel
Ocean Commotion
Jazzy Jellies
Swishy Fishies
Sand box underneath the high rise playground
And we rode most things multiple times. As long as someone is riding with your toddler he can ride stuff. Shamu Express though no matter who is with them, they have to be tall enough. For the other stuff, (although the flying fiddler had a restriction of some kind) you just can't send a child younger than 14 on with them. That's where the 14 years old thing comes in and that might be what is confusing. Anybody under 42in has to have someone 14 or older with them. When we were there a 10 year-old tried to get on ocean commotion with his younger brother and the worker said they had to get his mom.
He loved it. If photo bucket wasn't on life support or acting like it is, I'd post some pictures of him. I'm working on my trip report so should get them posted this weekend.