#2.
I would get a tourist visa, as your Airline may refuse to carry you without one..
*
For the past 10 years I have never had a visa ahead of time for Thailand, or the Philippines, for that matter!
I don't recall needing a visa ahead of time for Malaysia, Hong Kong and Singapore too!
Rarely has the airline clerk even asked me if I had any visa, when they did ask I told them that I will get a free 30 days permission stamp in my passport at the Bangkok airport overseas.
Then they give me my boarding pass and point to the gate. Just come back from Thailand 2 days ago!
(Most of the time I fly with NWA. Same-same when I flew with United, Korean Air, Thai Air and China Airlines years ago.)

#10
I fly with NWA from PDX often. They do have a person checking for proper travel documents, first at check in and then again at the gate. If you have an onward ticket within 30 days from Thailand there is no problem with getting on the plane without a tourist visa. If you are holding a visa for 2 months, or no visa, and your return or onward ticket shows 6 months out, you will have some hassles.
OP, I live in Portland, and the Thai consulate here is as stated above: an office run by an import company, I believe. here is their website
I got a interessting experience at Phom Phen just three days ago. I (Dutch citizen) wasn't asked for a return ticket, even though I didn't have a valid visa and therefore rely on visa exempt. (I did have proof of onward travel by the way_ But my Lao partner had problems: first the air asia check in guy checked the passport for a visa, then asked why there wasn't a visa in the passport, I answered that Lao citizens don't need a visa to enter Thailand. He then checked his computer, and then insisted on a return ticket, to which I answered that Lao citizens don't need to show proof of onward travel, to get 30 days, as it's not visa exempt (as 41 countries get) but mutual visa free access. He and another guy kept insisting on proof of onward travel, then I showed them the ticket into Amsterdam for my partner in three weeks, and after carefull examination of the e-ticket my partner was allowed to board.
Would have been if Air Asia gives their check in staff some training, as they were dead wrong in this case :)
sorry to bump an old thread, but could someone please confirm that this statement is still true..
[quote]If you get your visas BEFORE you get here then these rules do not
apply and you can stay longer between visa runs[/quote]
I have a double entry vias (UK citizen, visa obtained in London), nominally 2 x 60days.
If I make the second entry over land is it virtually guaranteed that I'll get the full 60 days, or is there a significant chance that the immigration guy will zap it down to 15 days, like a visa waiver?
Not sure yet of point of (re) entry, but will be either from Cambodia or Laos.