There's the OP's answer then - don't stay in Pattaya, go to Hua Hin instead. By the way there's no such thing (for most nationalities) as a 30 day visa on arrival. What you get is a 30-day exemption from requiring a visa at all or - slightly longer explanation - you get a permission to enter Thailand for a maximum of 30 days despite the fact that you don't have a visa. The nationals of a handful of countries are required to apply for a visa on arrival as their country is not in the visa exempt list, hence the "visa on arrival" signs displayed prominently at the airport