which country you from Lee? if you have the ability to apply for a tourist e-visa do that and when it comes through and you're in the country just do a border run when you want to start it
To add what Todd said one of the hurdles you're going to have is getting a bank account in thailand that quickly - most wont let you get it on a 30 day exempt but some will on a tourist. (Bangkok bank) is very friendly however you'd need a certificate of residency and to buy their insurance depending where you go before you can open up a bank acc