Your accommodation will be as expensive as your needs so it depends on your standards.
The next most expensive things are alcohol and Europeen food so once again it is up to your needs and habits.
Traditional Thai food is dead cheap. The beach cost nothing, they also have free outdoor exercise machines in parks or in places where people run if you are into fitness. Any other fancy activities, like elephant rides, quads, day trips by boat…etc can be pricey. Taxis are getting more and more expensive so I recommend you rent a motorcycle (but only if you feel confident enough tho coz they drive like mad and it is fairly dangerous on the roads!).
Apart from that, enjoy the relaxing life that Thailand has to offer! 👍
I bought 5 months of traveling insurance and all I had was a one way ticket to Thailand when I was applying for my 60 days visa. It was approuved in 24h online.
Also, I never had to prove that I had a returning ticket on arrival or departure (from London). All they care about here is your vaccinations even for domestic flights or outdoors street markets.
Ps: just extended my 60 days by another 30 days today and it was very easy!
