Another voice here....
I think some people should avoid using wheelchairs or
ECVs if at all possible. If the extent of your injury or disability allows you to walk (maybe with resting breaks) but not to stand in one place for a long time, I would still suggest you skip the wheelchairs.
Here are my reasons. In the last ten or so years, the parks have begun to change their smooth walking paths to textures (cobblestones, fake dirt, etc). This makes for a bumpy ride for the person in the wheelchair and can cause naseau.
Another reason is the person in the wheelchair tends to be excluded from conversations, have their views blocked, kicked or bumped by passers-by, etc..
Get a GAC and ask the CM at the ride for a place to sit in the shade or A?C for the duration of the queue, or for a fast pass to come back later. If neither of those can be provided, then an alternate access should be provided.
Trust me. Those who visit the parks with a disability still experience long waits, have to rest more often, arrive earlier for parades, might miss a bus because the handicap lift isn't working, etc. No one is getting off light here.