It is a madhouse. The crowds are bad, the heat is on.
That being said, it can be done and you can have a good time. Just be flexible. We always have a plan for each day, but when it is crowded, we know that our plans may change. We may switch parks, change directions, etc.
On the last trip over the July 4th weekend, we used the 4th as our water park day and watched the fireworks from the beach after dinner at O’hanas.
You will see the crowds dip back down during the week, but the next weekend it will pick back up. Plan your must do activites for Tuesday, Wednesday and Thursday.