I just had surgery the other day (8/23) and I went down by myself - it was way easy, nothing to be worried about. I stayed at the Holiday Inn Express in Old Town Sand Diego, they sent a shuttle to pick me up and take me from the air port to the hotel, Old town is great and safe, and just a few blocks long so I walked all around by myself that night, it was fun, the next mornign my shuttle driver for the hospital was waiting for me right at 9am outside of the hotel. He drove us across the border - we never had to get out of the van some one just poked their head in and counted us and we were flagged to move ahead, within 5ive minutes we were at the facility. Going back across the border was easy too, you just stand in line and the border guy glances at your passport and waves you on. He didn't stamp it, ask for id or anything - it looked more intemidating than it was. The shuttle driver was there the whole time.