Bikes sound like a great idea until you decide to live in the hills/mountains, or a place where it rains/snows often, or you need to buy more than 4 bags of groceries, or you live in a desert.
I lived on top of a steep hill where it gets icy and we still rode bikes. You learn pretty quickly. You should watch mountain biker down mountain races on YouTube. People are more like mountain goats than you know!