Make sure you have some knowledge of public transport for the city you are travelling to it will make your trip alot easier. Know routes of baht buses and song theaws. For the most part it's not necessary to get taxis unless late at night.last time I was there hua hin had a green songtheuw that covered a fair portion of the city for fifteen baht. Pattaya lots of baht buses for ten baht and chiang mai you just told them where you wanted to go for 30 baht. Bangkok metro and bts covers large part of the city centres then you have so many buses and if adventurous back street boats.phuket has almost no public transport so unless you have your own motorbike or vehicle you will have to be paying daily for taxis which is inconvenient.
Just get a bus next time is bout 150 baht from pattaya to Bangkok and they run very frequently.unless your in phuket. Most places in Thailand its better to use public transport.