You can get a fast pass at almost any ride to return at a later time in the day. They are best to use at rides that have long wait times. You need your park entrance ticket in order to get a fast pass. I believe you can only have one at a time. The majority of rides are wheelchair accessible, but there are a lot of hills at Disneyland so be prepared for that. I do not believe there are any special offers for wheelchair users. I hope that helps.
You can do multiple rides on fast pass but they're is a two hour waiting period between fast pass registration for each ride
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