Hi, Seng! Welcome to planDisney. You've brought us a great question about hotel packages. It looks like you are just a few weeks away from your upcoming visit!
If you already have purchased tickets you can certainly book a Disneyland Resort Hotel, however, there is no option to make it a
Disneyland Resort Hotel Package. To purchase a package, you will need to purchase the tickets and hotel stay together at the time of booking. The date you are arriving at Disneyland Resort is close to Christmas, which means the Disneyland Resort Hotels could already be full. If you are hoping to make a reservation, I suggest you try to do that as soon as possible. The other option would be to look into
Good Neighbor Hotels in the area as there are a lot of great options that are also within walking distance of the parks.
You are correct that parking is not guaranteed just because you have purchased theme park tickets. There are
two main parking areas that are options for your visit, Toy Story Parking Area and Mickey & Friends and Pixar Pals Parking Structures. The earlier in the day that you arrive at the parks means you run less of a risk of them filling up. I haven't heard of both parking areas filling up in quite some time, so I hope you will be okay. Another option would be for you to stay at a Good Neighbor or Disneyland Resort Hotel so that you can park at your hotel and just walk to the parks without worrying about parking.
Seng, I hope this information was helpful for you and your upcoming visit. If you have any other questions for us, please come back and see us again! See you real soon!
Carrie