Absolutely. The lazy river is not deep at all (some people just walk it and don't use the intertubes) There are family slides too and none of that is deep. For the big wave pools, just do what my mother always did at the beach - sit at the "entrance" of the "beach" and enjoy the very low waves as they come in. Trust me, there are a LOT of people doing the same thing. And a LOT of kids who can't/won't go out any further.
Now that I think about it, there really isn't any true swimming at any water park. It's more like playing in the water.