If you get to the park a bit before opening you can watch the opening ceremony. It's a cute little show and gets everyone in the mood!
Disney Transport will take you to any park, DTD and with transfers, to any resort. So, if you want to have a meal at another resort, don't hesitate to make an ADR. Just leave about an hour's travel time so you can get there. Usually, going from one resort to another requires a transfer at DTD or TTC.
Depending upon when you arrive, if you don't want to use a ticket on the first day, you can always go to DTD. That's what we used to do when we lived in the north east and flew in. The first and last day of our vacation were always at DTD.
Have a great time!