Summation of many trips

I was fortunate enough to visit San Diego twice earlier this year, so I made 5 trip to Hong Kong over my two visits

Border crossing has been covered. I will only add that I think the walk is every bit as long as in the past. Mexican immigration is easy, if you plan to cross more than once than keep your visa, it is good for a week and will save you some time. Taxi cab is almost always $5, although on one trip I was charged $6. Returning to the U.S. is much easier as the lines are much shorter than the past, I never waited more than 5 minutes. Say "Hong Kong" at the border and "frontera" to the taxi cab driver when you are ready to go back

I like the closest parking lot to McDonalds on the right after you cross the trolley tracks, it is small. Usually $10-$15 on weekends (including Sundays), and $8 during the week.