M.W.
Kalahari all the way! It is SO HUGE! They have an indoor water park (biggest in the US I believe I read), outdoor water park, and a huge indoor arcade/amusement park! You truly would NOT have to leave. And even your 14 month old would enjoy it. They have these jumpers in the water to place young kids in and they can jump and swing in the water! They also have special kids areas with slides and stuff. And their lazy river is HUGE. Plus they have a big wave/(beach like surf) area to just hang out in as well! Check them out online. We've stayed there many times and had a blast! The last time we got the big "suite" that had 3 rooms connected to a kitchen, living room, deck. So we cooked all our own meals. SO GREAT!
(We stayed there before we had kids, when our daughter was like 1 1/2, when our kids were 2 1/2 and 1 month, and a couple more times that I can't remember exactly....... But ALWAYS had a great time at the Kalahari!)
We've also stayed at the Chula Vista. Were NOT impressed. The park was small. The water was FREEZING! Our daughter (1 1/2 at the time) turned BLUE it was sooooo cold! None of us could even enjoy it because the water was so awful. And we didn't pay to have food included so we just brought our own and ate in the room. (Sandwiches, hotdishes to microave, etc.)
If you choose to go out and do something else, go on a duck boat ride! That was fun (but expensive!) We bought a package that included a riverboat? ride as well. That got long and kind of boring.............