I am sure most of you who travel the area know of this. West of the city, just off the I-376(parkway), about 10 minutes from the airport, lies Settlers Cabin County Park. I am no way slamming Sandcastle, but if you just need a wave pool fix, then this is it.
I haven't been there for a few years, but I hear it is still nice. Its only about $6 to get in, and only $3 for a tube rental. Free parking. They have a astro turf deck area, a huge grass lawn, a good concession area, and platform diving with underwater windows.
Just thought anyone passing through who wants an afternoon diversion at a good price should check this place out. I have never been in Sandcastle's pool, but Settler's is better than Wet'N' Wild in Orlando. Easier on the feet, too.