Indeed, and therefore proof-of-accomodation is good to bring as well. Next year, we will have an invitation letter from relatives for that (not much effort).
There are differences, in particular Visa-on-Arrival is not 60 days. Read up - the Washington embassy has better web pages on this than other embassies.
The airlines (for example SAS) can be pretty stupid about this. A thai friend discovered this at the airport and had to buy an unneeded ticket to Malaysia.