I think the thing I miss most is being able to be spontaneous. Just being able to get up and go without having to think about all the possible scenarios. Will there be a bathroom? Will I have to walk alot? What if I don't take a nap...will I be able to keep up with everyone else? Will there be stairs? What about crowds....I can't do crowds anymore. Is it too hot? Will I have to eat while I'm there?
Sometimes it just gets to be too much. And it's just easier to stay home.