Oh first congrats on your first ever trip to dl!!!!
You should stop at city hall and get a first visit pin, you'll find people being very helpful if they see it's your first visit.
You should try a corndog from the red wagon in DL on mainstreet. Apparently the ones in California adventure aren't as good, but I know from experience the ones in DL are NOT to be missed.
You should get a dole whip by the tiki room. It's to die for.
You should watch the fireworks from the hub, get there early to save a spot.
You should try Photopass, its a great way to get your whole family in the pictures at great locations around the parks.