Dear Annjanette,
Greetings from Los Angeles!
Thanks for submitting your question to the Disney Parks Moms Panel!
In my opinion, the Chip 'n Dale Critter Breakfast at the
Storytellers Cafe is one of the most unique dining experiences at the
Disneyland Resort because the food is great and you get to meet rarely seen Disney characters! I won't spoil it for you but make sure you have your Disney PhotoPass handy!
The security checkpoint you're referring to actually opens at 7am to allow access to the Downtown Disney area. This is true even if the Parks don't open until 10am. So rest assured you will have absolutely no problem getting to your 8am reservation at
Disney's Grand Californian from your location on Harbor Blvd.
Have fun and don't forget to enjoy a must-have Mickey-shaped waffle!
-Anabel M.