Are you staying at the resort? Hotel guests get an extra hour in the parks which is a good opportunity to get on some rides whilst it’s quieter - we used it to get on Peter Pan’s Flight without the horrendous queues it gets later in the day. It’s also a good time for character meets if that’s your thing, we saw Winnie the Pooh with next to no queue first thing.
If you want to meet characters, Character Breakfast at Plaza Gardens is a good thing to do, you get to meet 6 characters this way.
In terms of rides, just keep an eye on the app for when ride times come down for some of the more popular rides and just play it by ear when there really, something like Tower of Terror or Space Mountain really fluctuates with how long the queues are whereas some like Crush, Peter Pan and Big Thunder tend to have long queues pretty much any time of day.
For food it depends what type of stuff you want, fast food is always available just avoid the lunchtime rush if you can, whereas buffet and table service tend to get booked up so if you want these book through the app as far in advance as you can.
Me and my family love DLP so happy to provide any more advice depending on what you want to prioritise on your trip.