看城头新闻说是现在去加、墨等国旅行３０天内返美无需签证,可行性到底有多大啊？
-100%. but I don't think it is useful for you because you have a multiple entry US visa to return to us UNLESS your US visa expires.
那么我就走近期一趟，只是旅游，不申请签证。
-That only means you do not need the US visa to return to US (just use the valid I-94). But you still need to get the Canadian visa to enter Canada. You do not need a Mexico visa to enter Mexico.
我年底回国，到时候会在国内申请multiple entries签证回来。但老人明年不一定过来了。快70岁的人，走一趟真的不容易了。
另外从机场入关也可以吗？还是必须得开车入关的地方啊？
-Both ways are OK.
