How do they accomodate those who have mobility issues ?

It's plenty of room. All one level. No worries

There are walking paths. There were stairs at certain places. Didn't explore where all stairs went, most looked like they went to observation decks.. Paths were stable for carts and people using canes.

Almost everything has a paved walkway, so if you have a wheelchair, it should be pretty accessible. There are no stairs to my knowledge. There are a few gravel walkways, but these are mostly flat.