Most people at IofA tend to 'do' the clockwise thing, starting at Marvel Super Hero Island and working round to Seuss Landing. I am not sure how busy it will be but, presumably, in August there will be a fair few there.
To avoid the crowds, you could work your way round anti-clockwise, doing Seuss Landing (to the right) first.
Alternatively, the 2 (IMO) best rides (Hulk and Spiderman) are pretty much immediately on your left as you go through the gates, so you could do those first and then go back to the right and continue round that way.
US is a lot more spread out but, again, I would head for The Mummy first (which, if I remember rightly, is pretty much straight ahead as you enter), then backtrack to do Terminator.
Not sure how FOTL works at US/IofA - is it the same as FP at Disney? If so, then FP Terminator and ride The Mummy or vice versa.