Hi Lisa, welcome to planDisney!
Wow, I'm so excited for you! My family and I LOVE the
Disneyland Hotel! It's super close and within walking distance to the
Downtown Disney District,
Disneyland Park, and
Disney California Adventure Park. This is great if you need to take a break from the parks and rest a bit at the hotel! And if time permits, I highly recommend dining at
Goofy's Kitchen at the Disneyland Hotel. My family and I attended the breakfast buffet, and it was amazing. The food was fantastic and Chef Goofy and his friends came out many times dancing and having a GOOD TIME!
But back to your question, you can absolutely park at the hotel when you arrive. I recommend taking your luggage, checking in early with the front desk, and leaving your luggage there while your room gets ready. Then you can head on over to the parks and have a MAGICAL DAY!
I hope you have the best time!
See ya real soon!
Jin