You are correct in your thinking that travelling overland will be different than flying blast19. As long as you can come up with a list of countries you will or even might visit you should be able to go to their embassies (lucky having them on your doorstep) and ask some questions about arriving by land. I think you will be able to work it out.
I would visit the Embassies though and not rely on any comments here on the TT.


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<hr>We will probably get as many visas as possible before leaving, especially the required ones.<hr></blockquote>
Listen to Ruth.
With some countries, the clock starts ticking on your visa as soon as it gets stamped in your passport.
Much easier to get them as you go. Normally cheaper too.
Ruth is right. I have flown and overlanded through all of Indo China, Myanmar and India, on an Australian passport, getting visas as I go and have never been asked for proof of ongoing travel or funds. I have always got the visas in the outgoing country or on arrival depending on their rules, which are easy to find out from travel guides and embassy websites. Laos is the only place I got caught...as above (#11), the visa, which I got in Vietnam started on the day of issue, not arrival, but on a subsequent trip I got it on arrival (took longer to cross the border though) and therefore this wasn't an issue. Don't sweat it, they are more than happy to take your tourist and visa dollars.
#12 there is a HUGE difference between travelling on an Australian passport and a Mexican one. Those of us with first world passports really don't know how lucky we are and don't realise how often rules are relaxed for us. OP any chance of your wife getting US citizenship?

We will likely be waiting to get some of our visas until we're in neighboring countries. Thanks for those tips. That makes sense.
My wife has a green card which should help if there's border problems. But we can also show bank statements with plenty of money on them. I don't anticipate too many problems really and traveling is about dealing with problems and having fun anyway.
Thanks for all the answers and advice.
I would suggest checking in advance for the requirements for Mexican passport holders. Perhaps they have a ministry of foreign affairs website with links for this sort of information. If not, I suppose that you can use the US Consular Information Sheets which should link to the embassy websites which should have the information on visa requirements for all passport holders.
This should help you to be prepared in case there is some peculiar requirement for Mexican passport holders.
Ruth
One more thought. US passport holders can now get one year multiple entry visas for China for the same price as a single entry tourist visa. I would suggest getting one before you depart for Asia. Also I would present an itinerary that shows travel in China for about 50 days and does NOT include Tibet or western China. This might enable you to get 60 days per entry instead of the standard 30 days per entry.
Ruth

China will be tough for us. Due to the nature of the way we're going to travel, through the South Pacific and then overland from S. Korea into China, we really don't have tickets to show in order to get visas to China. Obviously I will be looking into this, but if we can wait until we're in Seoul to get visas for China that would be ideal.
Thanks again Ruth.

Can't speak for others, but I've never had to show a ticket to get a Chinese visa (but I've always just gotten the 30-day visa). It should not be a problem getting it in Seoul, as long as you have a few days there.
I was suggesting that you consider getting the Chinese visa in advance because for US passport holders it appears to be easier and there is a higher likelihood of getting this for 60 day per entry instead of 30 days per entry if it is obtained in the US.
I don't know about Mexican passport holders.
I do know that Chinese visas do NOT require onward tickets. Many people enter China and depart overland to adjacent countries.
Ruth