Pretty damn easy..I always park on the US side and walk through the border..you can just walk into Mexico..no id check or any of that..the place I know is about a 15 minute walk from the border..the big party place in TJ is ave revolution and that is about a 20 minute walk from the border or a $5 taxi ride..and then getting back in the US, you just show your id and your back in the homeland..easy as that..