I just came on to ask the same question! My main worry is the possibility of it closing in the afternoon due to it being the rainy season (arrive in 13 days). We definitely don't want to miss out, but we love to RD the parks, so usually go to the water parks much later in the day (planning two late afternoon visits during 10 night stay).
I have pondered with the idea of our second AK day being an afternoon park day (arrive around 4pm) and head to TL at 10am for a few hours in the dry weather and hopefully a quiet park, but it's a saturday so does that affect crowd levels. I've never visited in August and with only one water park being open, does that affect the crowds? Hopefully someone will report back to us both.