Go on a day that's either threatening rain, is raining, or has just had a storm pass through. People clear out in the rain. I've been three times in July and all three times it was less crowded than the times I have been in the dry month of January.
If you can't go on a day like this, just get there early and ride Cheetah Hunt first. Chances are it will rain at some point during the day even if its just a small passing storm so wait it out until then and enjoy a cleared-out park afterwards.
Ok, thanks. I hope we get a rainy day