Hi Lorraine, welcome back to planDisney!
Park hopper tickets are a great choice! When purchasing a park hopper ticket, you will need to select the first theme park you plan to visit. After entering the first park, you will be able to "hop" over to the next theme park starting at 1:00 p.m. You can then go between parks as much as you like until each park's closure!
I just checked the
Disneyland Resort's Hours & Events Calendar for the week of October 9, 2022, and both
Disneyland Park and
Disney California Adventure Park open that week at 8:00 a.m. Guests staying at one of the
Disneyland Resort Hotels will gain
Early Entry, allowing them to take advantage of admission to both parks 30 minutes early to enjoy select attractions, dining, and shopping!
I just checked the
Theme Park Reservation Availability Calendar and I see full availability for both parks the week of October 9, 2022, so you should be good to go! The main advantage of making your theme park reservations as part of your Disneyland Resort Hotel reservation is that Disneyland Resort Hotel Guests can access a separate pool of reservations reserved for Guests staying on-site. But since the week of October 9, 2022, has full availability, you shouldn't have any issues making your reservations.
I hope this helps, but if you have any more questions at all, please do visit us again!
See ya real soon!
Jin