Physios are often interested in us walking more. But they haven't been through it, and don't have our bodies. I think it is wise to walk as much as you can but not past the point where the pain increases too much. The body is a better guide to our activity level than the physio.
Rest when you want to rest, walk when you want to walk. At my six week check up I confessed to my surgeon that I hadn't done any of the physio and he said - and I quote 'don't blame you, they're a bloody nuisance, and you look ok to me' haha, I was a bit surprised but I listened to my body. As for using the bathroom whilst out and about, it is difficult, no raised toilet seat for one! It will all get easier, give yourself time xx