I have taken my boys, now 14 and 16 to Disney over the past 10 years 14 times. We have never done an enight, or early entry. If you are going for 8 nights in early May, you will have enough time to see the attractions that are offered for your kids ages. I know the lines won't be as long during that time. If they are early risers, go for breakfast, get to the park, and see what you can before they melt down. Only you can decide whether or not they can nap in a stroller, or on your lap during show. From past experience, I can recommend the Hall of Presidents for a great nap inducer in small children. It's air conditioned and dark. You may find you make it til about 4 in the afternoon, and see just about everything they can go on. If they nap later in the day, you may take in Epcot in the evening. If you are at the Poly , you can hop on the monorail to both. We are going in Aug for the BC and GF - I stayed off site only one time, and never again. It just wasn't the same.