TL is the place to go with little ones. My DS was 8 the first time we went but there were loads of families with tiny ones. You can even hold your wee one in the wave pool but I would suggest you not go in too deep, it can get rough. There are little lagoons all in front of the wave pool with little island type sections to slow up the water.
Ketchakiddie Creek is a young children play area with loads to do. Shark Reef is a neat place to take the kids to see all the fish and go below the water into a ship to view the fish too. The wave pool has a slide for the little ones also, it is off to your left as you face it the wave pool.
The lazy river is the best. Loads of surprises a long the way.
There is also a very shallow pool in front of Crush n Gusher. If you are waiting for older or adult companions who are riding on CNG, the little ones can play in the shallow pool.
We usually go to the water park in the morning and hit a major park in the afternoon. If you go in the morning, go at rope drop. It is fun. Everyone waits at the rope, as you would in a major park, and when they drop the rope, you walk almost at a jogging pace to claim your spot. The good spots go fast. There are areas with umbrellas, covered tables or areas with palm trees. TL is definately more shaded than BB.