I know there must be info somewhere but I can't seem to find it. My sister will be visiting in October and I want to take her to
Disneyland. She is currently using a wheelchair but will hopefully be able to walk by October. I assume however she will need to use one of those
ECV things for major walking though. I know they will deliver to the hotel, (we will be at the Grand) but what should I know about the parks?
So she'll have her own offsite rental scooter correct? A lot of the times they are smaller than the huge beasts available for rent at the parks. My mother has MS and uses a scooter while at Disneyland, so I'm very familiar with the experience, and the stress

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If you stop by City Hall at DL, or Guest Relations at DCA ~ and not sure but maybe also any ticket booth or the Guest relations outside either park, you can get a leaflet guide that will list where you can enter if you are traveling with a scooter or wheelchair.
Yes KPeveler is correct about DCA vs. DL. . Here's some DCA tips - and by "you" I do mean your sister, but I'm already "you-ing" away so it's just easier

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If you enter with the scooter at the Soarin' attraction you will be placed in row number 3, which is the lowest row so you will have feet dangling above you - you can always request the top row but you may have to wait longer.
If you see the Aladdin show and wish to enter with the scooter, I suggest showing up as early as possible so you can line up in the Orchestra section (45 to 40 minutes if you don't have a Priority seating pass) . This will allow you to enter directly into the theater when the doors open up, you will have the option to park the scooter inside or ride it into the seating area, they have areas reserved for chairs and it is a pretty good spot. If the Orchestra section waiting area fills up and you can no longer access the ground level then it's elevator time which is a pain and a very slow process.
World of Color will have sections reserved for chairs/scooters, if you decide to see it, when you are ready to wait in the line ask a cast member where you should go because they do have a waiting section for people who need priority seating. This group will be let in first so they can get settled in safely.
Now for Disneyland:
Usually the exit of the attraction is where a scooter or chair will enter and line up, but this is not true for all attractions so that leaflet guide will come in handy. Haunted Mansion will let your sister ride the scooter in if she doesn't feel comfortable walking a short distance - she will be standing/walking for at least 15 minutes, it's quite the experience if she brings it in and she can drive it directly to the loading area, and get a little behind the scenes peek - you do not enter via the exit.
Pirates is via the exit, wait is not too bad, however if you see a long line of chairs and scooters outside then that is a bad sign because it also means that there's a long line waiting inside - you only see a long outside when it's very crowded and backed up.
Indiana Jones is via the exit, just follow the exit path until you can't continue and a castmember is usually stationed there to help. You will use an elevator to cross over. I don't think people should view using a scooter or chair as a way to skip the line, but it sure does come in handy for this ride

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Space Mountain is via the exit, and the line is usually slow and long, but sometimes it's not so give it a try, or use a Fast Pass (without the scooter).
Captain E.O. will let you enter before the stand-by public, same with the Jungle Cruise which is also via the exit.
Matterhorn is via the stand-by line at first, but you get to skip the line within the houses so it does save on time.
Nemo has an entrance next to the exit, it is usually slow but the wait will be shorter than the stand by line.
Big Thunder Mountain is via the exit, I noticed that they've organized things a little more and they now have a sign and a castmember there to assist - well at least it was like that when we were there 2 weeks ago.
Peter Pan in my opinion is a nightmare! It's through the exit but the exit is not chair friendly and things can really get uncomfortable and crowded if there's a lot of people waiting.
Fantasmic has a section reserved for chairs, it's to the right and right next to the Mark Twain dock. No area for fireworks show in front of the castle, best to show up at least an hour early to be able to access that area before it fills up.
Nighttime at Disneyland for a scooter isn't fun, especially if you're fighting Fantasmic and fireworks crowds, wouldn't hurt to get a lot of things that light up or glow to help your sister stand out. We use flashing bicycle lights that we bought at a dollar store and a flashing necklace.
Good luck!
~Michelle