Do your best to get to the parks by 10 am on day one, spend 2-3 hours walking the parks, riding some rides - you will absolutely be able to ride near 15 rides with EP in those few hours, so you can hit what looks best and get a feel for the park layout. Grab a map onsite that has show times, you will have express for them as well. Then grab lunch and go back to your rooms - swim or nap based on how you feel from the late night arrival. Not knowing what time of year or park hours that you are going, we have found a wave of people leave the parks between 5-6 pm and evenings in the parks with dwindling crowds are just superb! That night, pull out the maps and make sure you didn't overlook anything that you feel is a must do, the spend Day 2 filling in the gaps and riding your faves a second/third/fourth...time.
And please, don't overlook the shows! Horror Make Up show is great and air conditioned, Blues Brothers is so fun, but is out in the heat pending time of year, the pet show is entertaining but not a must. And if you are a Potterhead, there are shows in those areas as well.