Journey in ordinary buses costs not much, Thailand in respect of public transport is quite developed, but buses are, usually, overflowed and places in them are calculated on thin Thais, instead of on huge foreigners. If you decide to use public transport in Thailand, choose buses with the kondyuky. Journey to them will manage slightly more expensively, but they are reliable and conductors in such buses know English. Keep in mind that back places in buses of Thailand are reserved for monks and if you sit down there, and the monk will enter into the bus, you should give way.
Tremendous rest in Thailand from Yekaterinburg will be a fine gift to your 2nd half for a honeymoon.