The best thing to do is to ask at the entrance of the ride where to go, as a few rides are accessible with a walker or wheelchair. If you have to use the alternative entrance, you may be directed to wait for a ride vehicle, you may have wait in a line with other people using the accessible entrance, or you may get a wheelchair return time. It will depend on how many people are using that entrance and how much space they have for people to wait. If you get a return time, there is usually a line to wait in when you return. Have you thought about a renting a manual wheelchair, so that he can push it like a walker if he wants to walk, but also sit if you have to wait at the accessible entrance. With a manual wheelchair, the accessible entrance procedure is the same as it is with a walker.