Have you happen to have read the DLR guide for WDW vets?
Weather is much nicer than WDW in general, far less humidity. It will be hot to possibly very hot and sunny in the middle of summer.
Magic Morning are on Tues, Thurs, Sat and Sun. If you get a 3 day of longer park hopper you can enter DL on one of those days an hour early. Only Fantasyland and Tomorrowland will be open. Resort guests can enter on any of those days for thier whole trip.
With breakfast, you can go to Ariel's Grotto in DCA, but if you finish early have to go back to the Rope Drop area.
In DL you can eat at Minnie and Friends breafast at the Plaza Inn. While this works in some cases, because you can enter without using or needing the Magic Morning credit, you can eat and be done and join in the Magic Morning crowd.