Where can I take a woman (83) who is blind and can't walk that will entertain her outside her home?

Just the act of getting into the car and going for a short drive can take up a surprising amount of time. I used to take mom to the beach to listen to the waves and gulls, or we would go through the drive thru and get coffee or a snack and we would sit at the park to eat. If you have a mall nearby go to the food court.
Take her with you when you go for groceries, she can hold the basket while you wheel her down the aisles.
You might check out local seniors centres or adult day cares in your area.
Something she might enjoy at home are audio books, nowadays there are so many available from local libraries at the click of your mouse.

Near a waterfalls, she can hear that and smell it.