Wait wait wait! You are staying at the Carousel and you're taking ART? In case you don't know, you will be saving yourself *maybe* 5 minutes of walking to and from the bag check at
Disneyland each day. Out of the hotel, down to the crosswalk, across the crosswalk, then walking past where ART drops you off. I'm not even sure how close in your ART vehicle will drop you; you could end up saving only 2 or 3 minutes of walking.
Have you been to Disneyland; if not, have you looked at an overhead map of it? If not, please do; something like googlemaps, "hybrid" view so you see landmarks and streets will be good.
If you really really need to save those steps, OK, but since you'll probably have to go to where you can make a u-turn to get back to the entrance for ART, it might actually take you longer than if you were to walk. At least take a good look at the maps and really consider it.
edited to add:
I just mapped it out on mapmyrun; from the front of the sidewalk to a bagcheck shelter, it's approximately a quarter of a mile (with the approximate distance to an estimate of where ART would drop you being .16 mile from the sidewalk).
I was looking at your previous posts just to make sure I hadn't made a huge gaffe, to see if you had mentioned walking problems, but only saw a mention of a daughter who will be able to get up and walk over to the gates. So I don't think I have made a horrible error. If I have, I apologize. If not, please consider just saving that money and walk on over.