The best idea for touring the park is to start in Adventureland and go clockwise around the park. Keep in mind when the first parade starts and make sure that you are on the OTHER side of it before it starts. The parade will prevent you from crossing the park. You will want to be on the Splash Mountain / Big Thunder side of it. Wait to see the second parade if you can. During the first parade ride SM, BTMRR, and HM. Make sure to get a photopass picture of your party next to the carriage that sits in front of the Haunted Mansion. They make some neat adjustments to your final photo. Keep touring the park clockwise until you have done all of the attractions and photo ops that you want to do. Make sure to get a spot in front of the castle for the fireworks show. Also, be sure to arrive early for the second parade. The Headless Horseman appears before the scheduled start time. I think you can get into the park as early as 4:00 with your party ticket. Some will tell you to wait until 5:30 or 6:00 to enter the park so you will see the transformation of Main Street. I don't think that is necessary. You will be just as surprised if you see it when you are waiting for the fireworks and parade. Very nice touch. Besides, the lines at the attractions thin out around 30-40 minutes before official closing time so that is a good time to hit the rides. We were able to ride SM and BTMRR 3 times apiece and walking right on each time.
The fireworks and parade are OUTSTANDING!!!
HTH. If you can think of anything else, I'd be happy to help.