Welcome back to planDisney, Cheryl!
I am thrilled to hear that you'll be staying at Disney's Grand Californian Hotel and Spa during your Disneyland Resort vacation! This hotel is truly magnificent and the dedicated entrance directly into Disney California Adventure Park is an amazing perk! Simply staying at a
Disneyland Resort Hotel does not guarantee entry into the theme parks, however. You will need your valid theme park tickets and theme park reservations each day of your trip in order to access the parks. Additionally, the theme parks are always subject to capacity limitations which is why admission is never "guaranteed." But I wouldn't worry about capacity limits for your trip in June.
With your vacation package, you will have to make theme park reservations separately once your arrival date is 120 days or less away. To do so, you will start on the
"Theme Park Tickets and Reservations" page and click the "Make Park Reservations" button. After logging into your Disneyland resort account, you will land on the "My Theme Park Reservations" page. Scroll down and click the "Retrieve Hotel Reservation" button. After entering your vacation package confirmation number, last name, and arrival date, you will be directed back to make theme park reservations for your trip. With your Park Hopper tickets, you will make reservations for the park you want to start at each day and then at 1:00 p.m., you can hop to the other park.
I hope this helps! Have a wonderful time at the Happiest Place on Earth!
-Linda