Yeah, we did the same thing - went to the Old Spaghetti Factory and when leaving we got stuck going the wrong way over the bridge. Between one-way streets and very scary parts, it was pretty tough finding our way back to the right part of town. Thank goodness it wasn't dark.
When I was 18, two of my girlfriends and I hitchhiked through E.St.Louis. Two blondes and a red head. We had no clue.